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いつしか

before one knows it, gradually, eventually

i t͡s ɨ ɕ i k a̠
adverb Rare #39,666
before one knows it, gradually, eventually Often describes a change that happens unnoticed over time.
JA: 話しているうちに、いつしか夜になっていた。
EN: Before we knew it, it had become night while we were talking.

二人の友情はいつしか愛情へと変わっていった。

Over time, their friendship blossomed into love.

冬はいつしか春となった。

Before long, winter had turned into spring.

秋はいつしか冬となった。

Before I knew it, autumn had turned into winter.