…a pump in which liquid is moved out of the pump chamber by a moving surface or by the introduction of compressed air or gas…
…an animal or human activity that seems inappropriate, such as head-scratching when confused, considered to arise unconsciously when a conflict between antagonistic urges cannot be resolved…
…a unit of measurement of a ship’s weight representing the weight of water it displaces with the load line just immersed, equal to 2,240 lb or 35 cu. ft (0.99 cubic metres)…
