swear verb

1 use bad language

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

VERB + SWEAR hear sb He heard her swear under her breath.

PREP. at He swore loudly at her and left.

2 make a serious promise

ADV. solemnly He swore solemnly that he would never hit her again. | on oath

VERB + SWEAR 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.

PREP. by I swear by Almighty God to tell the truth. | to I swear to you, I don't know anything.

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