could have sworn
This page is about the conversational phrase could have sworn
You can say this when you're very sure about something, esp. when it seems you could be wrong.
- Mary sat up and shook Stan. "I could have sworn I heard someone moving downstairs. Go down and check."
- Barry looked at the bill. "It says here I had four bottles of beer, but I could've sworn it was only three."
Grandma said, "I could've sworn this door was locked." She said this
Contributor: Matt Errey