The meaning of STUN is to make senseless, groggy, or dizzy by or as if by a blow : daze. How to use stun in a sentence. to make senseless, groggy, or dizzy by or as if by a blow : daze; to shock with noise… See the full definition. Games & Quizzes; Games & Quizzes; Word of the Day; Grammar; Wordplay; Word Finder ...