Webster's English Dictionary

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stun

stun \'st*n\ vt or stunned;  or stun.ning [ME stunen, modif. of F estoner - 
   more at ASTONISH] 1: to make senseless or dizzy by or as if by a blow  2: 
   to bewilder with noise : DAZE  3: to overcome esp. with astonishment or 
   disbelief : STUPEFY  - stun n