Learn what "i could swear" means, when people say it, and how to use it naturally in English.

It means the speaker is expressing strong certainty about something they remember seeing.
From I Think My Wife Wants To Kill Me, Episode 17
The speaker insists they clearly remember there being salt on the table.
Use this when you want to insist that your memory is correct. It can sound mildly argumentative if you are correcting someone.
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