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в тыл

to the rear

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phrase Rare #39,498
to the rear Often used in a military context to mean toward or into the area behind the front lines. The related form «в тылу» means “in the rear.”
RU: Санитарный поезд отправили в тыл.
EN: The medical train was sent to the rear.

Надо его в тыл отправлять.

He needs to be sent to the rear.

— Иваново детство (1962)