Necked \Necked\, a.1. Having (such) a neck; -- chiefly used in composition; as, stiff-necked.
2. (Naut.) Cracked; -- said of a treenail.
Source: Webster's Revised Unabridged Dictionary (1913)
Neck \Neck\, v. t. [imp. & p. p. Necked; p. pr. & vb. n. Necking.] (Mech.) To reduce the diameter of (an object) near its end, by making a groove around it; -- used with down; as, to neck down a shaft.