知らないうちに

without knowing

→ 知る
phrase Rare #37,805
without knowing Used when something happens while someone is unaware of it, often translated as “before I knew it” or “without my knowing.”
JA: 知らないうちに、季節が変わっていた。
EN: Before I knew it, the season had changed.

アナ親が知らないうちに結婚した

Ana got married without her parents knowing.

知らないうちに寝てしまったんだ

I must have fallen asleep without realizing it.

知らないうちに飛行機は着陸していた

Before I knew it, the plane had landed.