v. o•bliged, o•blig•ing. v.t. 1. to require or constrain, as by law, conscience, or force. 2. to bind morally or legally, as by a promise or contract. 3. to place under a debt of gratitude for a favor or service: We are much obliged for the ride. 4. to do a favor or service for; accommodate: He obliged us with a song.