Etymology

sweater

sweat·er
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Today it means: A knitted jacket or jersey, usually of thick wool, worn by athletes before or after exercise. Full definition →

Middle English swētere
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The story

  1. Middle English · inherited fromswētere
  2. English todaysweater

From Middle English swētere, equivalent to sweat + -er.

Etymology from Wiktionary, CC BY-SA 4.0.