...his tendency to change his mind at whim.
Could I change "at whim" into "on a whim" without affecting the meaning?
I don't remember ever hearing or reading at whim. Clive
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I've not heard "at whim."
I have heard this quite a bit.
... his tendency to change his mind at the drop of a hat.
anonymous...his tendency to change his mind at whim.
Could I change "at whim" into "on a whim" without affecting the meaning?
"At whim" seems possible on the model of "at will", but it calls attention to itself because of that. "On a whim" is normal there.