на слух

by ear

→ на

phrase Rare #38,918

by ear Used when recognizing or doing something by listening rather than relying on written or visual information. In на слуху, the added у changes the meaning to “well-known” or “in the public eye.”

RU: Я могу сыграть эту мелодию на слух.

EN: I can play this melody by ear.

Том играет на пианино на слух.

Tom plays the piano by ear.

На слух целиться!

Aim by ear!

— Битва у Красной скалы (2008)

Да так, на слух сложно.

Yeah, it’s hard to make out by ear.

— Leto (2018)