No. 1,698 in Japanese
いつの間にか
"いつの間にか" means "before one knows it" or "unnoticedly."
In a sentence
昨日、いつの間にか時計が止まってしまった。
Yesterday, the clock somehow stopped without me noticing.
The phrase "いつの間にか" is used to express something happening without one's awareness or notice.
気が付いたら、いつの間にか外は暗くなっていた。
I realized that it had somehow become dark outside.
Here, "いつの間にか" conveys that the speaker was unaware of the gradual change in light.
いつの間にか春が終わり、夏が始まっていた。
Spring ended and summer began before I knew it.
In this sentence, "いつの間にか" denotes that the transition from spring to summer occurred unnoticed.
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