dive

• plunge, submersion; dubious nightclub, sleazy nightclub
jump into water (especially headfirst); go underwater, submerge; descend rapidly to earth; enter into quickly, plunge
if you dive, you jump head-first into water with your arms straight above your head.
to dive also means to go under the surface of the sea or a lake, either using special breathing equipment or in a specially designed vessel.
when birds and animals dive, they go quickly downwards, head-first, through the air or water.
if you dive in a particular direction, you jump or rush in that direction.
if you dive into a bag or cupboard, you put your hands into it quickly in order to get something out; an informal use.
see also diving, dove.