At the Drop of a Hat
Immediately, right now, instantly, at the slightest occasion.
Etymology
Derives from the common practice of starting competitions by dropping hats or sports caps.
Drop [drɔp]
A drop, a droplet.
A fall, (a) drop.
(To) drop, let fall, lower, fall, release, cards force the opponent to play a high card, fall (for a high card when playing a higher suit of the same color).
An idiom is a phrase whose meaning differs from the meaning of the words in it, considered each separately and in isolation.
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