to plunge into water, esp. headfirst.

to go below the surface of the water, as a submarine.

to plunge, fall, or descend through the air, into the earth, etc.

The acrobats dived into nets.

Aeronautics . (of an airplane) to descend rapidly.

to penetrate suddenly into something, as with the hand

to dive into one's purse.

to dart

to dive into a doorway.

to enter deeply or plunge into a subject, activity, etc.

to cause to plunge, submerge, or descend.

to insert quickly; plunge

He dived his hand into his pocket.

an act or instance of diving.

a jump or plunge into water, esp. in a prescribed way from a diving board.

the vertical or nearly vertical descent of an airplane at a speed surpassing the possible speed of the same plane in level flight.

a submerging, as of a submarine or skindiver.

a dash, plunge, or lunge, as if throwing oneself at or into something

He made a dive for the football.

a sudden or sharp decline, as in stock prices.

Informal . a dingy or disreputable bar or nightclub.

Boxing . a false show of being knocked out, usually in a bout whose result has been prearranged

to take a dive in an early round.