ピアノを弾いた

played the piano

→ ピアノ
phrase Rare #37,311
played the piano 弾く means “to play” an instrument such as a piano; 弾いた is its past form.
JA: 昨日、ピアノを弾いた。
EN: I played the piano yesterday.

トムはピアノを弾いた。

Tom played the piano.

ルーシーはよく食後ピアノを弾いたものだ。

Lucy would often play the piano after meals.

彼女はかなりうまくピアノを弾いた。

She played the piano quite well.

彼女はよく放課後ピアノを弾いたものだ。

She used to play the piano often after school.