The Vietnamese word "bôi" is a verb that means "to apply" or "to spread" something onto a surface. It is commonly used to describe the action of putting on a thin layer of various substances.
When using "bôi," you generally follow it with the item you are applying and the surface where you are applying it. For example, you might say "bôi thuốc đỏ" to mean "apply merbromin" (a type of antiseptic) to a wound.
bôi thuốc đỏ: to apply merbromin (an antiseptic) on a cut.
bôi dầu: to apply oil.
bôi hồ lên giấy: to apply glue on paper.
bôi son: to apply lipstick.
In more advanced contexts, "bôi" can imply doing something in a careless or superficial way. For instance, "công việc bôi ra" means "to do one's work by halves," indicating that the work is not being done thoroughly.