(verb) To tie; to confine by any ligature.
"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."
"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."