To disgust or cause displeasure (archaic); to alienate or estrange someone through displeasing behavior.
From a- (prefix) + gust (taste/inclination), possibly influenced by disgust. The form suggests Middle English origins in an older negative construction.
The prefix 'a-' used to be really productive for creating opposites, but we've mostly abandoned it for 'un-' and 'dis-.' Seeing 'agust' reminds us that English constantly reorganizes its tool kit for making words!
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