People who fail to win or succeed in a competition, contest, or endeavor. Often used pejoratively to describe those perceived as unsuccessful or inadequate.
From Middle English 'losen' meaning 'to lose,' derived from Old English 'losian.' The suffix '-er' creates the agent noun, with '-s' making it plural. The derogatory sense developed in 20th century American slang.
Interestingly, 'loser' didn't become a common insult until the 1950s, when it emerged from gambling culture. The word's power as an insult lies in how it reduces complex human worth to simple win-lose binary thinking.
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