Meaning of “over-the-counter” - Learner’s Dictionary

over-the-counter

adjective [ always before noun ] uk us /ˌəʊvəðəˈkaʊntər/

Over-the-counter medicines can be bought in a shop without first visiting a doctor.

over-the-counter adverb

Most of these drugs can be bought over-the-counter.

(Definition of “over-the-counter” from the Cambridge Learner’s Dictionary © Cambridge University Press)