Thumb \Thumb\, v. t. [imp. & p. p. Thumbed; p. pr. & vb. n. Thumbing.]

1. To handle awkwardly. --Johnson.

2. To play with the thumbs, or with the thumbs and fingers; as, to thumb over a tune.

3. To soil or wear with the thumb or the fingers; to soil, or wear out, by frequent handling; also, to cover with the thumb; as, to thumb the touch-hole of a cannon.

He gravely informed the enemy that all his cards had been thumbed to pieces, and begged them to let him have a few more packs. --Macaulay.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Thumb \Thumb\, n. [OE. thombe, thoumbe, [thorn]ume, AS. [thorn][=u]ma; akin to OFries. th[=u]ma, D. duim, G. daumen, OHG. d[=u]mo, Icel. [thorn]umall, Dan. tommelfinger, Sw. tumme, and perhaps to L. tumere to swell. [root]56. Cf. Thimble, Tumid.]

The short, thick first digit of the human hand, differing from the other fingers in having but two phalanges; the pollex. See Pollex.

Upon his thumb he had of gold a ring. --Chaucer.

Thumb band, a twist of anything as thick as the thumb. --Mortimer.

Thumb blue, indigo in the form of small balls or lumps, used by washerwomen to blue linen, and the like.

Thumb latch, a door latch having a lever formed to be pressed by the thumb.

Thumb mark.
   (a) The mark left by the impression of a thumb, as on the leaves of a book. --Longfellow.
   (b) The dark spot over each foot in finely bred black and tan terriers.

Thumb nut, a nut for a screw, having wings to grasp between the thumb and fingers in turning it; also, a nut with a knurled rim for the same perpose.

Thumb ring, a ring worn on the thumb. --Shak.

Thumb stall.
   (a) A kind of thimble or ferrule of iron, or leather, for protecting the thumb in making sails, and in other work.
   (b) (Mil.) A buckskin cushion worn on the thumb, and used to close the vent of a cannon while it is sponged, or loaded.

Under one's thumb, completely under one's power or influence; in a condition of subservience. [Colloq.]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Thumb \Thumb\, v. i. To play with the thumb or thumbs; to play clumsily; to thrum.

Source: Webster's Revised Unabridged Dictionary (1913)