Definition of on a whim
: because of a sudden decision
- He quit his job on a whim.
on a whim
idiom
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Word by Word Definitions
whim
play
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: a capricious or eccentric and often sudden idea or turn of the mind : fancy
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: a large capstan that is made with one or more radiating arms to which a horse may be yoked and that is used in mines for raising ore or water
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