The Collaborative International Dictionary of English v.0.48:

power-dive \power-dive\, power dive \power dive\n.
   An airplane maneuver in which the pilot deads downward at a
   steep angle while the engines are operating at or near full
   power; -- a method to descend rapidly.
   [WordNet 1.5] power dive

The Collaborative International Dictionary of English v.0.48:

power-dive \power-dive\, power dive \power dive\v. i.
   To make a power dive, as of an airplane.
   [WordNet 1.5] power dive

The Collaborative International Dictionary of English v.0.48:

power-dive \power-dive\, power dive \power dive\v. t.
   To cause (an airplane) to make a power dive; as, he
   power-dived his plane to escape the attackers.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

power dive
    n 1: a dive of an airplane that is accelerated both by gravity
         and by the power of the engine