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за ухо

by the ear

→ за
phrase Rare #50,289
by the ear With the instrumental form за ухом, it means “behind the ear.” The phrase describes location or an action involving the ear, depending on the case and context.
RU: Он взял ребёнка за ухо.
EN: He took the child by the ear.

Ты кусала его за ухо.

You bit his ear.

— Карандиру (2003)