Definition of half cock
1 : the position of the hammer of a firearm when about half retracted and held by the sear so that it cannot be operated by a pull on the trigger
2 chiefly British : a state of inadequate preparation or mental confusion <go off at half cock>
First Known Use of half cock
Learn More about half cock
Seen and Heard
What made you want to look up half cock? Please tell us where you read or heard it (including the quote, if possible).