The idiom "at the drop of a hat" is believed to have emerged in the mid-19th century. The phrase is often associated with Western cowboy culture, where dropping a hat was used as a signal to start a horse race or a fight. The action of dropping the hat was meant to initiate an immediate response or action from the participants.

What is the origin of the idiom "at the drop of a hat" and when to use it?

"at the drop of a hat"的定义和意义

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