The Vietnamese word "lợp" is a verb that means "to cover" or "to roof." It is commonly used in the context of putting a roof on a house, but it can also refer to covering other objects or surfaces.
Lợp nhà - To roof a house.
Lợp mái - To cover the roof.
While "lợp" primarily means "to cover" or "to roof," it can also imply the act of putting a protective layer over something, such as when you cover a dish to keep it warm.