Swear
/swˈɛr/
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Definition
(verb) To take an oath, to promise intensely, solemnly, and/or with legally binding effect.
Sentence Examples
You should swear on the Bible.
They won't believe me even if I swear it is true.
CEFR Practice Quiz
I ____ that I will do my best to complete the project on time and to a very high standard today.