The female athletes this year are each one cooler than the last.
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Social-media slang, very common after 2020. Classical 飒 meant 'sound of wind / valiant' (as in 英姿飒爽); the modern usage compliments a woman's confident, sharp, no-nonsense energy. Named a 2020 Top 10 buzzword by 《咬文嚼字》.
usage
Applied mostly to women (short hair, suits, uniforms, athletic moves). Male equivalent is closer to 帅 (shuài). Pairs well with 英姿飒爽 'in valiant and graceful spirit.'