noun Date: 1982 a drug (as alcohol or marijuana) whose use is thought to lead to the use of and dependence on a harder drug (as cocaine or heroin)
GATEWAY DRUG
Meaning of GATEWAY DRUG in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012