(verb) To tie; to confine by any ligature.
"So also there are tides and floods in the affairs of men, which in some are slight and may be kept within bounds, but in others they overmaster everything."
"Loneliness is bred of a mind that has grown earth-bound."
"I am not bound to win, but I am bound to be true. I am not bound to succeed, but I am bound to live up to what light I have."