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on a whim
Definition of on a whim
: because of a sudden decision He quit his job on a whim.
From the M-W Editors
Word by Word Definitions
whimplay
: a capricious or eccentric and often sudden idea or turn of the mind : fancy
: 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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