Definition of you would swear
- Her English is so good that you would swear she has been studying it for years.
- You'd swear (that) the jewels are real.
: past tense of will
: wished, desired
: wish for : want
: to utter or take solemnly (an oath)
: to assert as true or promise under oath
: to assert or promise emphatically or earnestly
: oath, swear word
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