getting one's finger caught; jamming one's finger
Refers to accidentally catching or pinching a finger, typically in a door, drawer, or similar object. Often used in everyday situations.
See also: 指を詰める
I got my finger caught in the door.
yakuza finger-cutting ritual
Refers to the traditional yakuza practice of cutting off a finger joint as an apology or sign of loyalty. This is a culturally specific term.
子供が引き出しで指詰めをしないように気をつけて。
Be careful so the child doesn't jam their finger in the drawer.
Finger-cutting is one of the rituals performed among yakuza.
A compound of 指 and 詰め, from 詰める in the sense “shorten; cut down.” The yakuza sense refers specifically to amputating part of a finger; the ordinary sense “getting a finger caught” reflects the separate sense “jam; trap.”