Without any hesitation; instantly.
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To do something immediately, without any hesitation or preparation.
When someone acts at the drop of a hat, they’re ready to go at any moment — no delay, no excuses.
It can describe both enthusiasm (always ready to help) and impulsiveness (acting without thinking).
"In the Blink of an Eye"
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Happening extremely quickly, describing the speed of an event
"Without a Second Thought"
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Do something immediately with no doubt or hesitation in the mind
"At the Drop of a Hat"
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Do something immediately without any hesitation