на ногу

on the foot; onto the leg

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phrase Rare #31,227
on the foot; onto the leg Нога can mean either “foot” or “leg,” depending on context. With verbs of motion or placement, на ногу often means “onto the foot/leg.”
RU: Кошка прыгнула мне на ногу.
EN: The cat jumped onto my leg.

Мне на ногу забрался паук.

A spider climbed onto my leg.

Том наступил Мэри на ногу.

Tom stepped on Mary's foot.