иCподтишка?

Что значит изподтишка?

Настоящие озарения подкрадываются незаметно и бьют изподтишка.

Те — тоже хороши. Боялись термидора,
а бонапартишка — изподтишка, как раз, —
(как дико голова, и нет пирамидона)...
Французу — Корсика, что русскому — Кавказ.

исподтишка

to do smth. secretly, unexpectedly, while no one was waiting.

Quote:

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Originally Posted by Ramil

to do smth. secretly, unexpectedly, while no one was waiting.

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Picky detail of English: it's better not to say "waiting" here. Instead we would say, "while no one was expecting it."