Perspiration or moisture that comes from your skin when you're hot or nervous; can also refer to clothing like sweatshirts or sweatpants.
From Old English 'swæt,' a Germanic word related to heat and moisture. The word has referred to bodily perspiration since ancient times, and the clothing sense developed in the 20th century.
Sweat is one of those words that has become more casual over time—it went from being something you definitely wanted to hide in polite company to naming casual comfortable clothes, which says something about how fashion and informality have changed.
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