swear

(verb) utter obscenities or profanities. Synonyms: curse, cuss, blaspheme, imprecate. Examples: "The drunken men were cursing loudly in the street."

(verb) to declare or affirm solemnly and formally as true. Synonyms: affirm, verify, assert, avow, aver, swan. Examples: "Before god i swear i am innocent."

(verb) promise solemnly; take an oath.

(verb) make a deposition; declare under oath. Synonyms: depose, depone.

(verb) have confidence or faith in. Synonyms: trust, rely, bank. Examples: "We can trust in god." "Rely on your friends." "Bank on your good education." "I swear by my grandmother's recipes."