What does the word bound mean?

Usage examples for bound

  1. See that you keep him bound: and do you hear? – The Comedies of Terence by Publius Terentius Afer
  2. " I don't think, sir, I am bound to tell you. – The Autobiography of Mark Rutherford by Mark Rutherford
  3. And, he being a man of his word, it was bound to come- bound to come.... – Anthony Lyveden by Dornford Yates