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いつしか

before one knew it, at some point

i t͡s ɨ ɕ i k a̠
adverb Rare #37,030
before one knew it, at some point Somewhat literary or poetic.
JA: いつしか春になっていた。
EN: Before I knew it, it had become spring.

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.

秋はいつしか冬となった。

Before I knew it, autumn had turned into winter.

冬はいつしか春となった。

Before long, winter had turned into spring.