From the 連用形 (ren'yōkei, “stem or continuative form”) of the verb 刳る (kuru, “to gouge, hollow out”).
刳り • (kuri)
- a hollow, something that is cut or gouged (out)
- 襟の刳りの深いワンピース
- eri no kuri no fukai wanpīsu
- a low-cut dress
- (literally, “a dress on which the cut of the collar is deep”)
- scooping, hollowing