“could have”

The following 3 entries include the term could have.

could have fooled me

phrase

—used to say that something seems very surprising or doubtful based on one's own observations

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could have sworn

phrase

—used to say that one feels definitely sure about something though it appears not to be true

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you could have knocked me over with a feather

phrase

—used to say that one was extremely surprised or astonished when he or she found out about something

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