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Meaning of under-the-counter

un•der-the-count•er

Pronunciation: (un'dur-u-koun'tur), [key]
— adj.
  1. (of merchandise) sold clandestinely.
  2. illegal; unauthorized: under-the-counter payments.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.