An informal or dialectal word meaning 'against' or 'again,' often found in regional speech.
From Middle English agein, agayn (against, again), which evolved into this shortened form in casual speech. Over centuries, pronunciation changes made it sound like 'agin' in certain dialects.
The word 'agin' appears in Mark Twain's novels as a marker of authentic frontier speech, and linguists use it as evidence that Appalachian and rural American dialects preserve older English forms rather than corrupting them.
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