遅刻しちゃう

will be late

→ 遅刻
phrase Rare #37,631
will be late Informal contraction of 遅刻してしまう. Often expresses concern or regret about ending up being late.
JA: 急がないと、授業に遅刻しちゃうよ。
EN: If we don't hurry, we'll be late for class.

遅刻しちゃうかと思った

I thought I was going to be late.

ママが遅刻しちゃう

Mom's going to be late.

— ライフ・イズ・ビューティフル (1997)

遅刻しちゃう

I'm going to be late!

— 崖の上のポニョ (2008)