swear

Verb

• have confidence or faith in
  • We can trust in God
    
  • Rely on your friends
    
  • bank on your good education
    
  • I swear by my grandmother's recipes
    

• make a deposition; declare under oath

• promise solemnly; take an oath

• to declare or affirm solemnly and formally as true
  • Before God I swear I am innocent
    

• utter obscenities or profanities
  • The drunken men were cursing loudly in the street
    

Related words

• Synonyms: 
  trust , rely , bank , depose , depone , affirm , verify , assert , avow , aver , swan , curse , cuss , blaspheme , imprecate
• Antonyms: 
  distrust , mistrust , suspect