せりふを

lines

→ 台詞
phrase Rare #24,332
lines せりふ means a character's lines or dialogue in a play, movie, or other performance. を marks it as the object of the verb.
JA: 俳優は自分のせりふを練習しています。
EN: The actor is practicing his lines.

彼女は自分のせりふを非常に早く覚えた

She memorized her lines very quickly.

私はせりふを全部暗記できるようにを声に出して読んだ

I read the play aloud so I could memorize all my lines.

その俳優舞台でせりふを忘れた

The actor forgot his lines on stage.