A spicy sauce made from tomatoes and peppers, or a lively style of Latin American music and dance.
From Spanish 'salsa' meaning 'sauce,' derived from Latin 'salsa' (salted). The music/dance meaning developed in mid-20th century New York when Cuban and Puerto Rican musicians fused their traditions.
Salsa as a music genre was literally invented in 1960s New York by Caribbean immigrants, despite the name meaning 'sauce'—it's because the music mixed many flavors of Latin rhythm so completely that calling it a blend made perfect sense. Now salsa is more associated with dancing and music worldwide than with actual tomato sauce, showing how cultural meaning can completely transform a word.
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