freebase

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++free·base /ˈfriːbeɪs/ verb [intransitive, transitive]  to smoke a pure form of the illegal drug cocaine 吸食（精炼可卡因） —freebasing noun [uncountable]

free·base verbChineseSyllable  

freebase
free‧base /ˈfriːbeɪs/ verb [intransitive and transitive]
to smoke a pure form of the illegal drug cocaine
—freebasing noun [uncountable]

free·baseBrE /ˈfriːbeɪs/ 🔊NAmE /ˈfriːbeɪs/ 🔊 noun [uncountable] (slang) a specially prepared form of the powerful illegal drug cocaine 精炼可卡因