tub (Noun) — A relatively large open container that you fill with water and use to wash the body. ex. "he played with his rubber ball in the tub"
tub (Noun) — A large open vessel for holding or storing liquids. ex. "The rain water drains into this big tub"
tub (Noun) — The amount that a tub will hold. ex. "a tub of water"
tub (Verb) — Plant or put in a tub.
tub (Verb) — (informal) have a bath.