a forward dive in which the diver while in the air assumes a position with the arms outstretched at shoulder height and the legs straight and together, and enters the water with the arms stretched above the head. Also called, esp. Brit., swallow dive.
Pronunciation: (swon'dīv"), [key]
—v.i., -dived, -div•ing.
1. to perform a swan dive.
2. to decrease suddenly and decisively; plummet: Stock prices swan-dived overnight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.