cock

a cock-and-bull story a ridiculous and implausible story.

☞ The expression 'talk of a cock and a bull' is recorded from the early 17th century, and apparently refers to an original story or fable which is now lost.

at full cock (of a firearm) with the cock lifted to the position at which the trigger will act.

at half cock: seehalf.

cock a leg (especially of a male dog) urinate. informal euphemistic

cock a snook: seesnook.

cock of the walk someone who dominates others within a group.

☞ The places in which cocks bred for fighting were kept were known as walks: one cock would be kept in each walk and would tolerate no other birds in its space.

cock your ear listen attentively to or for something.

☞ The image here is of a dog raising its ears to an erect position.