To move gently and vertically, in either a single motion or repeatedly up and down, at or near the surface of a body of water, or similar medium.
The ball, which we had thought lost, suddenly bobbed up out of the water.
To move (something) as though it were bobbing in water.
I bobbed my head under water and saw the goldfish.
To curtsy.
To strike with a quick, light blow; to tap.
To cut (hair) into a bob haircut.
I got my hair bobbed. How do you like it?
To shorten by cutting; to dock; to crop
To bobsleigh.