Words similar to swear

Example sentences for: swear

How can you use “swear” in a sentence? Here are some example sentences to help you improve your vocabulary:

I swear that they were laughing at us.
to swear blind
(I swear.)
Frog-fate, or no frog-fate, swear I see at times one
(As Clarence Darrow said in Inherit the Wind , "I don't swear just for the hell of it."