起きたの

happened

→ 起きる

phrase Common #5,884

happened 起きる means “to happen” or “to occur” in these examples; it can also mean “to wake up.” の can make the phrase sound like a question or request for an explanation.

JA: 何が起きたの？

EN: What happened?

いつ起きたの？

When did you wake up?

あれ起きたの？

Oh, you're awake?

— Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020)

それは一体どうして起きたの。

How on earth did that happen?

信じれないことが起きたの。

Something unbelievable happened.

怖い事が起きたの

Something scary happened.

— サスペリア (1977)