verb
Meaning 1
Is very sure about; especially when the thing in question is apparently not the case or could be doubted.
Definition source: English Wiktionary via Wiktextract
Usage: informal
Examples
- "You lost your bracelet?" "Yeah, but I could have sworn it was in the kitchen on the table when I last saw it."
Meaning relationships
Synonyms: none provided
Antonyms: none provided