Collocations for swear - verb

loudly | quietly, silently, softly, under your breath | viciously, violently

hear sb
He heard her swear under her breath.

at
He swore loudly at her and left.

solemnly
He swore solemnly that he would never hit her again.

on oath

be prepared to
I would be prepared to swear on oath that they didn''t see me.

make sb
He made her swear on the Bible that she wouldn''t leave him.

by
I swear by Almighty God to tell the truth.

to
I swear to you, I don''t know anything.

swear sb to secrecy/silence
We were all sworn to secrecy about the plan.