adjective Etymology: from the hiding of illicit wares under the counter of stores where they are sold Date: 1926 surreptitious and usually irregular or illicit
UNDER-THE-COUNTER
Meaning of UNDER-THE-COUNTER in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012