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stun / stən/ • v. (stunned, stun·ning) [tr.] knock unconscious or into a dazed or semiconscious state: the man was strangled after being stunned by a blow to the head. ∎  (usu. be stunned) astonish or shock (someone) so that they are temporarily unable to react: the community was stunned by the tragedy. ∎  (of a sound) deafen temporarily: a blast like that could stun anybody.ORIGIN: Middle English: shortening of Old French estoner ‘astonish.’