Meaning
Instantly, without any hesitation, warning, or need for persuasion.
It is used to describe someone who is always ready to act, react, or make a decision the very moment an opportunity or provocation arises, with no delay or preparation needed.
Origin
The phrase comes from a nineteenth-century American practice of using the visible, unmistakable drop of a hat as a starting signal for a fight, a race, or a duel, since a hat was an object nearly everyone carried and could be seen falling from a distance. Once the hat touched the ground, the action began immediately, and the image was carried over into general English to describe anything happening without delay.
Examples
He will start an argument at the drop of a hat if you mention politics at dinner.
The volunteers are ready to help at the drop of a hat whenever there is an emergency.
She can switch from English to French at the drop of a hat, without even thinking about it.
A: Would he really quit his job to travel the world?
B: Absolutely, at the drop of a hat.
Frequently asked questions
What does 'At the drop of a hat' mean?
Instantly, without any hesitation, warning, or need for persuasion.
It is used to describe someone who is always ready to act, react, or make a decision the very moment an opportunity or provocation arises, with no delay or preparation needed.