Type of Neckline That Shows a Lot of Décolletage

This page is the CodyCross answer for the clue below from Science Lab, Group 316, Puzzle 5 (Wave Function).

Question is: Type of Neckline That Shows a Lot of Décolletage

and the answer is: PLUNGING

Word Meaning:

PLUNGING — present participle and gerund of plunge

Definitions from Wiktionary.