Meaning & usage
途端（に）expresses that something happens the instant another action occurs, often with a surprising or immediate result. It attaches to the past tense (plain past form) of a verb, and に is optional; the pattern is common in both casual and neutral speech.
Example sentences 8
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暗いトンネルに入った途端、私たちは何も見えなかった。
On entering a dark tunnel, we could see nothing.
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彼女がその本を読み始めたと思った途端、誰かがドアをノックした。
She had hardly begun to read the book before someone knocked at the door.
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その知らせを聞いた途端に、彼は青ざめた。
On hearing the news, he turned pale.
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君は彼女に会った途端に恋に落ちたのかい？
It was love at first sight when you met her?
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母はその知らせを聞いた途端青ざめた。
My mother grew pale on hearing the news.
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テレビで商品が紹介された途端、注文の電話がじゃんじゃんかかってきた。
As soon as the product was introduced on TV, the calls for orders started pouring in.
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真由は映画が始まった途端、寝ました。
Mayu fell asleep the moment the movie started.
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彼が帰宅した途端に雨が降った。
It rained as soon as he got home.