To advise against something; to recommend that someone not do something.
From dis- (opposite of) + advise. This archaic verb structure parallels the Old English pattern of adding dis- to create opposite meanings, though modern English prefers 'advise against.'
Instead of 'disadvise,' we now say 'advise against' or 'recommend against,' showing how English sometimes prefers compound phrases over single words with prefixes—efficiency in word-building changes over time.
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