like: bôi trơn
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
bôi trơn * ☊ 
to lubricate * ☊
[ bôi ] : (1) to smear, rub out, blot out, be careless; (2) cup
[ trơn ] : (1) smooth, slippery, fluent; (2) completely; solid, plain (pattern)