1 (of a submarine) dive rapidly and steeply to a deeper level in an emergency.
- ‘Often, in the mid-Atlantic, after forcing U-boats to crash-dive, carrier planes dropped homing torpedoes on the submarines.’
- ‘These allowed a submarine to surface and crash dive without having to send out crewmen to dismantle the mast in an emergency.’
- ‘Anyway, Brick's good piloting brought the sub back in view, now crash-diving to yet away.’
- ‘If the submarine had come under attack, both men would have quickly drowned with no hope of escape as their boat crash-dived.’
- 1.1(of an aircraft) plunge steeply downward into a crash.
A steep dive by a submarine or aircraft.
- ‘Forty minutes later we make a crash dive, regrouping at 15m below the surface current that whips across the reef-top.’
- ‘‘There was a lot of noise and debris flying about and the helicopter went into a controlled crash dive but Pete had only partially detached himself,’ said Mr Dell.’
- ‘The man admitted that he had been playing with the helicopter and was making a crash dive move.’