could have sworn
Definition of could have sworn
—used to say that one feels definitely sure about something though it appears not to be true I could have sworn that I left my keys on the counter.
Word by Word Definitions
: past tense ofcan
: used in auxiliary function in the past , in the past conditional , and as an alternative to can suggesting less force or certainty or as a polite form in the present
: past participle ofswear
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