もう遅いから

because it's already late

→ もう
phrase Rare #24,431
because it's already late もう means “already,” 遅い means “late,” and から means “because.” Commonly used as a reason for going home, turning something off, or going to bed.
JA: もう遅いから、そろそろ帰ろう。
EN: Because it's already late, let's head home soon.

もう遅いから寝なさい

It’s late, so go to bed.

— TITANE/チタン (2021)

もう遅いから帰るよ

It's getting late, so I'm heading home.

もう遅いから寝る

It's late, so I'm going to bed.

もう遅いからテレビを消しなさい

It's late, so turn off the TV.

もう遅いからお休み

It’s late, so go to sleep.

— 火垂るの墓 (1988)

もう遅いから寝よう

It's late, so let's go to bed.

もう遅いから

Because it's already late.

もう遅いから急ごう

It’s getting late, so let’s hurry.

— ライフ・イズ・ビューティフル (1997)