de oído

by ear

→ de
phrase Rare #28,303
by ear Used for doing or learning something by listening, without written music or instructions. In duro de oído, it means hard of hearing.
SP: Aprendí esa canción de oído.
EN: I learned that song by ear.

Tocaba el piano de oído.

He played the piano by ear.

Ella toca el piano de oído.

She plays the piano by ear.

Lo tocaremos de oído.

We'll play it by ear.

Mi abuelo es un poco duro de oído.

My grandfather is a little hard of hearing.

Tom es muy bueno tocando piano de oído.

Tom is very good at playing piano by ear.

No me dijiste que fuera duro de oído.

You didn't tell me I was hard of hearing.

— La noche americana (1973)

Tom puede tocar el piano de oído bastante bien.

Tom can play the piano by ear quite well.

Mi padre es tan viejo que es duro de oído.

My father is so old he's hard of hearing.

Tom toca la armónica de oído.

Tom plays the harmonica by ear.