- kaisoku being nimble-footed, being quick on one's feet, fast running legs
Literary or sports-writing word for swift running; rarer in speech than 足が速い. Often appears in race reports or character descriptions.
彼は快足で知られるランナーだ。
Kare wa kaisoku de shirareru rannā da.
He is a runner known for his swift feet.
その動物は快足を生かして逃げた。
Sono dōbutsu wa kaisoku o ikashite nigeta.
The animal used its fast legs to escape.
⚖️ Commonly confused with 快速 (kaisoku), which means fast speed, especially of trains, not legs.
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