帰ってくるまで

until someone comes back

→ 帰る
phrase Rare #26,360
until someone comes back 帰ってくる means “to come back” or “to return,” and まで means “until.” The subject can be understood from context, such as “you,” “he,” or “they.”
JA: 母が帰ってくるまで、宿題をします。
EN: I’ll do my homework until my mother comes back.

あなたが帰ってくるまでには私は寝ています

I’ll be asleep by the time you get back.

君が帰ってくるまで僕はここにいるよ

I'll be here until you come back.

でも帰ってくるまでどうするだよ

But what are we supposed to do until they come back?

— 七人の侍 (1954)

君が帰ってくるまで私は仕事を終わっているでしょう

I will have finished work by the time you come back.

彼が帰ってくるまでそれはそのままにしておこう

Let's leave it as it is until he gets back.

私は日本帰ってくるまでボストン音楽を勉強していました

I studied music in Boston until I returned to Japan.