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Adverb: at the drop of a hat
  1. (informal) without any hesitation; instantly; without any particularly good reason

Encyclopedia: At the drop of a hat

Nearest

at outs
at peace
at present
at random
at rest
at sea
at sign
at sixes and sevens
at stake
at the best
at the drop of a hat
at the least
at the most
at the ready
at the same time
at the worst
at times
at variance
at will
at work
at worst