a tube-shaped object, usually part of a machine, used for pressing, smoothing, crushing etc; a tube-shaped piece placed under an object to make movement easy, or round which something may be rolled easily

sea surf, current

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

sea surf, current