1) (to make) a quick movement up and down (bob)

2) (of levels, prices etc) to move up and down (fluctuate)

3) two lengths of wood, metal or rope, with crosspieces (called rungs), used to climb up and down (ladder)

4) (to cause a person, thing) to rise up; an electrical compartment in a building that moves up and down from one floor to another (lift)

5) (to cause something, oneself) to move from side to side, up and down etc (shake)

6) (to cause something) to move from side to side or up and down (wag)

7) (to cause something) to move from side to side or up and down (waggle)

8) a long ridge of water, especially on the sea, curling over and breaking on the shore; a steady increase and spread; a group of wavelengths used for radio broadcast; to move to and from, up and down (wave)