The Vietnamese word "man" (mần) is a verb that means "to do" or "to make." It is often used in casual and colloquial contexts, especially in the northern regions of Vietnam.
In summary, "man" (mần) is a versatile verb that signifies the act of doing or making something in a casual context. It can be used in various phrases related to daily activities, and while it is less formal than its synonyms, it is widely used in everyday speech, especially in northern Vietnam.