IdiomBody & SensesRussian

проверять на вшивость (proveryat' na shivost')

Meaning: To scrutinize or investigate someone closely to uncover hidden faults or problems; to vet thoroughly.

Literally: To check for lice

Example: “Новичка месяц проверяли на вшивость.” — They went over the new hire with a fine-tooth comb for a month.

Origin: Вшивость is lousiness, being infested with lice. The phrase is usually linked to the delousing inspections of armies, prisons and camps, where every recruit or inmate was checked, but this connection is not documented. Figuratively it means testing someone to see if they are reliable, or how they react under pressure.

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