Meaning of ないうちに in Japanese

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Definition of ないうちに

ないうちに(naiuchini) 【ない内に ·無い内に】

(exp) (after neg. stem of verb) before it becomes (verb); before (an undesirable thing occurs)
私たちは暗くならないうちにテントを張った。
We set up our tents before dark.

しらないうちに(shiranaiuchini) 【知らないうちに】

(exp, adv) before one knew it; before one realized it →Related words: 知らない間に
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.

I'm going to get going before this feeling goes!! Well they do say "Strike while the iron is hot".

Our policies and systems are getting outdated and need revising, but to try to swap horses while crossing a stream might be dangerous.

We had scarcely returned when it began raining.

It might rain before evening.

I had not waited long before the bus came.

その会社かいしゃに就職しゅうしょくしてする３年ねんも経たないうちに彼かれは重役になった。

He had not been employed by the company three years before he become a director.

All the dinner had been eaten before he came.

I had not waited long before he appeared.

あまり遠くへ行かないうちに、私わたしは彼かれに会った。

I had not gone far before I met him.

I had not gone very far when I was caught in a shower.