Dive

dive

1. a headlong plunge into water, esp one of several formalized movements executed as a sport

2. an act or instance of diving

3. a steep nose-down descent of an aircraft

4. Boxing slang the act of a boxer pretending to be knocked down or out

5. Soccer slang the act of a player pretending to have been tripped or impeded

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dive [′dīv]

(aerospace engineering)

A rapid descent by an aircraft or missile, nose downward, with or without power or thrust.

(engineering)

To submerge into an underwater environment so that it may be studied or utilized; includes the use of specialized equipment such as scuba, diving helmets, diving suits, diving bells, and underwater research vessels.

(navigation)

To submerge a submarine under power.

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Dive 

the movement of an aircraft or missile along a horizontally inclined trajectory of 30°-90°, accompanied by rapid loss of altitude and an increase in speed.

The flight trajectory during a dive consists of the leg of the dive proper, which is close to a straight line, and of curvilinear legs—the initial (entrance) and final (pullout) legs. A dive at angles of 80°-90° to the horizontal is called a vertical dive. Air brakes are used on aircraft and missiles to limit the increase in speed. Diving is used during attacks on aerial targets, during firing or the launching of rockets, and during the bombing of ground or naval targets. Diving is also used when it is necessary to lose altitude quickly. [19—1571—4•]