Flag \Flag\, n. [Cf. LG. & G. flagge, Sw. flagg, Dan. flag, D. vlag. See Flag to hang loose.]

1. That which flags or hangs down loosely. [1913 Webster]

2. A cloth usually bearing a device or devices and used to indicate nationality, party, etc., or to give or ask information; -- commonly attached to a staff to be waved by the wind; a standard; a banner; an ensign; the colors; as, the national flag; a military or a naval flag. [1913 Webster]

3. (Zool.)
   (a) A group of feathers on the lower part of the legs of certain hawks, owls, etc.
   (b) A group of elongated wing feathers in certain hawks.
   (c) The bushy tail of a dog, as of a setter. [1913 Webster]

4. (Zool.) One of the wing feathers next the body of a bird; -- called also flag feather. [Webster 1913 Suppl.]

Black flag. See under Black.

Flag captain, Flag leutenant, etc., special officers attached to the flagship, as aids to the flag officer.

Flag officer, the commander of a fleet or squadron; an admiral, or commodore.

Flag of truse, a white flag carried or displayed to an enemy, as an invitation to conference, or for the purpose of making some communication not hostile.

Flag share, the flag officer's share of prize money.

Flag station (Railroad), a station at which trains do not stop unless signaled to do so, by a flag hung out or waved.

National flag, a flag of a particular country, on which some national emblem or device, is emblazoned.

Red flag, a flag of a red color, displayed as a signal of danger or token of defiance; the emblem of anarchists.

To dip, the flag, to mlower it and quickly restore it to its place; -- done as a mark of respect.

To hang out the white flag, to ask truce or quarter, or, in some cases, to manifest a friendly design by exhibiting a white flag.

To hang the flag half-mast high or To hang the flag half-staff or To hang the flag at half-staff, to raise it only half way to the mast or staff, as a token or sign of mourning.

To strike the flag or To lower the flag, to haul it down, in token of respect, submission, or, in an engagement, of surrender.

Yellow flag, the quarantine flag of all nations; also carried at a vessel's fore, to denote that an infectious disease is on board. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

92 Moby Thesaurus words for "red flag": Roman candle, aid to navigation, alarm, amber light, balefire, beacon, beacon fire, bell, bell buoy, blinker, blue peter, buoy, caution light, danger sign, early symptom, falling barometer, flare, fog bell, fog signal, fog whistle, foghorn, gathering clouds, glance, go light, gong buoy, green light, heliograph, high sign, international alphabet flag, international numeral pennant, kick, leer, marker beacon, nod, nudge, omen, parachute flare, pilot flag, poke, police whistle, precursor, preliminary sign, premonitory sign, premonitory symptom, prodroma, prodrome, quarantine flag, radio beacon, red light, rocket, sailing aid, semaphore, semaphore flag, semaphore telegraph, sign, signal, signal beacon, signal bell, signal fire, signal flag, signal gong, signal gun, signal lamp, signal light, signal mast, signal post, signal rocket, signal shot, signal siren, signal tower, skull and crossbones, spar buoy, stop light, storm petrel, stormy petrel, symptom, the nod, the wink, thundercloud, thunderhead, touch, traffic light, traffic signal, warning sign, warning signal, watch fire, white flag, wigwag, wigwag flag, wink, yellow flag, yellow jack

Source: Moby Thesaurus II by Grady Ward, 1.0
 

red flag

Source: WordNet (r) 2.0
 

Red chalk. See under Chalk.

Red copper (Min.), red oxide of copper; cuprite.

Red coral (Zo["o]l.), the precious coral (Corallium rubrum). See Illusts. of Coral and Gorgonlacea.

Red cross. The cross of St. George, the national emblem of the English.
   (b) The Geneva cross. See Geneva convention, and Geneva cross, under Geneva.

Red currant. (Bot.) See Currant.

Red deer. (Zo["o]l.)
   (a) The common stag (Cervus elaphus), native of the forests of the temperate parts of Europe and Asia. It is very similar to the American elk, or wapiti.
   (b) The Virginia deer. See Deer.

Red duck (Zo["o]l.), a European reddish brown duck (Fuligula nyroca); -- called also ferruginous duck.

Red ebony. (Bot.) See Grenadillo.

Red empress (Zo["o]l.), a butterfly. See Tortoise shell.

Red fir (Bot.), a coniferous tree (Pseudotsuga Douglasii) found from British Columbia to Texas, and highly valued for its durable timber. The name is sometimes given to other coniferous trees, as the Norway spruce and the American Abies magnifica and A. nobilis.

Red fire. (Pyrotech.) See Blue fire, under Fire.

Red flag. See under Flag.

Red fox (Zo["o]l.), the common American fox (Vulpes fulvus), which is usually reddish in color.

Red grouse (Zo["o]l.), the Scotch grouse, or ptarmigan. See under Ptarmigan.

Red gum, or Red gum-tree (Bot.), a name given to eight Australian species of Eucalyptus (Eucalyptus amygdalina, resinifera, etc.) which yield a reddish gum resin. See Eucalyptus.

Red hand (Her.), a left hand appaum['e], fingers erect, borne on an escutcheon, being the mark of a baronet of the United Kingdom of Great Britain and Ireland; -- called also Badge of Ulster.

Red herring, the common herring dried and smoked.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Flag \Flag\, n. [Cf. LG. & G. flagge, Sw. flagg, Dan. flag, D. vlag. See Flag to hang loose.]

1. That which flags or hangs down loosely.

2. A cloth usually bearing a device or devices and used to indicate nationality, party, etc., or to give or ask information; -- commonly attached to a staff to be waved by the wind; a standard; a banner; an ensign; the colors; as, the national flag; a military or a naval flag.

3. (Zo["o]l.)
   (a) A group of feathers on the lower part of the legs of certain hawks, owls, etc.
   (b) A group of elongated wing feathers in certain hawks.
   (c) The bushy tail of a dog, as of a setter.

Black flag. See under Black.

Flag captain, Flag leutenant, etc., special officers attached to the flagship, as aids to the flag officer.

Flag officer, the commander of a fleet or squadron; an admiral, or commodore.

Flag of truse, a white flag carried or displayed to an enemy, as an invitation to conference, or for the purpose of making some communication not hostile.

Flag share, the flag officer's share of prize money.

Flag station (Railroad), a station at which trains do not stop unless signaled to do so, by a flag hung out or waved.

National flag, a flag of a particular country, on which some national emblem or device, is emblazoned.

Red flag, a flag of a red color, displayed as a signal of danger or token of defiance; the emblem of anarchists.

To dip, the flag, to mlower it and quickly restore it to its place; -- done as a mark of respect.

To hang out the white flag, to ask truce or quarter, or, in some cases, to manifest a friendly design by exhibiting a white flag.

To hang the flag half-mast high or half-staff, to raise it only half way to the mast or staff, as a token or sign of mourning.

To strike, or lower, the flag, to haul it down, in token of respect, submission, or, in an engagement, of surrender.

Yellow flag, the quarantine flag of all nations; also carried at a vessel's fore, to denote that an infectious disease is on board.

Source: Webster's Revised Unabridged Dictionary (1913)