stunyoudaoicibaDictYouDict[stun 词源字典]
stun: [13] Stun is virtually the same word as astonish and astound, and like them it denotes etymologically ‘leave thunderstruck’. It comes via Anglo-Norman estuner from Vulgar Latin *extonāre ‘stupefy’. This was a compound verb, formed from the Latin intensive prefix ex- and tonāre ‘thunder’ (a relative of English thunder) and based on the model of Latin attonāre ‘stupefy’, similarly formed from tonāre but with the prefix ad-. The variant *astoner produced English astonish and astound.
=> astonish, astound, thunder[stun etymology, stun origin, 英语词源]
stun (v.)youdaoicibaDictYouDict
early 14c., "to daze or render unconscious" (from a blow, powerful emotion, etc.), probably a shortening of Old French estoner "to stun" (see astonish). Related: Stunned; stunning.