under-the-counter

under-the-counter
ˌunder-the-ˈcounter adjective informal
under-the-counter goods are bought or sold secretly, especially because they are illegal

under-the-counterBrE /ˌʌndə ðə ˈkaʊntə(r)/ 🔊NAmE /ˌʌndər ðə ˈkaʊntər/ 🔊 adjective (informal) illegal 台面下的；非法的；私下的；暗中的