に足を

… the foot to/on

→ に
phrase Uncommon #17,975
… the foot to/on This is a grammatical fragment, not a fixed expression. に marks a destination, location, or recipient, while 足を marks “foot” as the object; the exact translation depends on the surrounding verb.
JA: 椅子に足をぶつけた。
EN: I bumped my foot against the chair.

警官がチンピラに足を撃たれた。

A cop was shot in the leg by a thug.

彼は急にブレーキに足をかけた。

He suddenly put his foot on the brake.

その時に足を痛めたんだ。

That's when I hurt my leg.

あの犬に足をかまれたんだ。

That dog bit me on the leg.

陸に足をつけてすぐ、キースが私を待っていた。

As soon as I set foot on land, Keith was waiting for me.