Meaning & usage
とあっては presents a special circumstance as the reason for an inevitable conclusion or action, often with a nuance of "if that's the case, then it can't be helped" or "there's no choice but to." It attaches to plain-form verbs, i-adjectives, na-adjectives plus だ, and nouns, including noun phrases like 方針 or すぐ後.
Example sentences 4
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社長が直々に頼んだとあっては、断るわけにはいかない。
Seeing that the company president asked me personally, there's no way I can refuse.
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台風で電車が止まっているとあっては、歩いて帰るしかない。
Now that the trains have stopped because of the typhoon, we have no choice but to walk home.
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店が半額セール中とあっては、買わない手はないだろう。
Owing to the store's half-price sale, there's no reason not to buy something.
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子供がそこまで熱心だとあっては、親も協力せざるを得ない。
Seeing that the child is that enthusiastic, the parents have no choice but to cooperate too.