1 affirm, assert, asseverate, attest, avow, declare, depose, give one's word, pledge oneself, promise, state under oath, swear blind, take an oath, testify, vow, warrant
2 be foul-mouthed, blaspheme, curse, cuss (informal) imprecate, take the Lord's name in vain, turn the air blue (informal) utter profanities
3 (with)
by depend on, have confidence in, rely on, trust