plunge verb

ADV. downwards, forward, head first, headlong The car plunged headlong into the river. | in The pool was declared open and eager swimmers plunged in.

PREP. down The bus came off the road and plunged down an embankment. | from He plunged from a tenth floor window. | into (often figurative) She plunged straight into her story. | off The car had plunged off the road.

PHRASES plunge to your death A climber plunged 300 feet to his death.