expression, i-adjective
fast on one's feet; quick at walking and running
Describes a person or animal that moves quickly on foot. Often used literally.
彼は足が早いから、すぐに追いつくだろう。
He's fast on his feet, so he'll catch up quickly.
あの選手は足が早くて、盗塁が多い
That player is quick and has many stolen bases.
expression, i-adjective
spoil quickly; go bad fast
Idiomatic expression for food that has a short shelf life or spoils easily. Often used with 食べ物 or specific items like 魚.
夏は生ものが足が早いから気をつけて。
In summer, fresh food spoils quickly, so be careful.
この魚は足が早いので、今日中に食べたほうがいい。
This fish goes bad fast, so you'd better eat it today.