Origin of Astonish
From an alteration (due to words ending in -ish: abolish, banish, cherish, establish, furnish, etc.) of earlier astony, astone, aston, astun (“to astonish, confound, stun”), from Middle English astonien, astunien, astonen, astunen, astounen (“to astound, stun, astonish”), from Old English *āstunian, from ā- (perfective prefix) + stunian (“to make a loud sound, crash, resound, roar, bang, dash, impinge, knock, confound, astonish, stupefy”), from Proto-Germanic *stunōną (“to sound, crash, bang, groan”), from Proto-Indo-European *(s)ten-, *(s)ton- (“to thunder, roar, groan”), equivalent to a- + stun. Compare German erstaunen (“to astonish, amaze”). Influenced by Old French estoner, estuner, estonner (“to stun”), either from an assumed Latin *extonare, or from Old Frankish *stunen (“to stun”), related to Middle High German stunen (“to knock, strike, stun”) and thus also to the Old English word above.
Alteration of Middle English astonen from Old French estoner from Vulgar Latin extonāre Latin ex- ex- Latin tonāre to thunder (s)tenə- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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