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TAKE THE QUIZ“could have”
The following 3 entries include the term could have.
could have fooled me
idiom—used to say that something seems very surprising or doubtful based on one's own observations
could have sworn
idiom—used to say that one feels definitely sure about something though it appears not to be true
you could have knocked me over with a feather
idiom—used to say that one was extremely surprised or astonished when he or she found out about something
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Merriam-Webster unabridged
