cock of the walk

American  

noun

1. the leader in a group, especially one with a conceited, domineering manner.

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cock of the walk British  

noun

1. informal a person who asserts himself in a strutting pompous way

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cock of the walk Idioms  

1. A conceited, bossy person, as in Since his last promotion he's been acting like the cock of the walk—he's unbearable. This expression alludes to the rooster's proud strut about the barnyard, asserting his rule over hens and chicks. [Mid-1800s]

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Etymology

Origin of cock of the walk

First recorded in 1850–55