The story
- Proto-Indo-European*dwóh₁
- Proto-Indo-European*trísinflu.
- Proto-Indo-European*d(w)is-
- Proto-Italic*dis-
- Latindis-
- Old Frenchdes-
- Middle Frenchdes-
- Proto-Indo-European*de
- Proto-Indo-European*déh₁
- Proto-Italic*dē
- Latindē
- Latindē-
- Frenchdé-
- Proto-Indo-European*kʷel-der.?
- Latincollum
- Old Frenchcol
- Middle Frenchcol
- Middle Frenchcollet
- Frenchcollet
- Frenchdécolleter
- Frenchdécolletage
- English todaydécolletage
Borrowed from French décolletage.
Etymology from Wiktionary, CC BY-SA 4.0.