D defs.my
Entry 1 sense Webster, 1913

Halfcock

/(-kŏk`)/ · Half·cock · IPA
01 v. t. To set the cock of (a firearm) at the first notch.
imp. & p. p. Halfcocked; p. pr. & vb. n. Halfcocking
  1. 1.
    To set the cock of (a firearm) at the first notch.
Phrases & compounds
To go off half-cocked — To be discharged prematurely, or with the trigger at half cock; -- said of a firearm.