(しゃてい)

しゃてい
noun
younger brother; underling; follower
personfamily
1. younger brother (humble)
A humble way to refer to one's own younger brother. An older, formal expression.
舎弟(しゃてい)おります
I have a younger brother.
My younger brother graduated from university this year.
舎弟(しゃてい)ついてまいります。
My younger brother will accompany us.
2. underling; follower; junior member
A subordinate or junior member in a hierarchical organization, especially in yakuza or gang contexts. Refers to someone who serves under a senior figure.
舎弟(しゃてい)()()れる
To bring along one's followers.
The underlings follow the boss's orders.
The scene in the movie where the boss's underling betrays him was memorable.

Sense 1 is the original meaning: (しゃ) is a humble prefix (as in 舎兄(しゃけい) for older brother) and (てい) means younger brother. This usage is quite formal and archaic. Sense 2 is the more commonly encountered modern usage, strongly associated with yakuza films and fiction. In this context, 兄貴(あにき) (big brother/boss) and 舎弟(しゃてい) (follower/junior) form a hierarchical pair. Related: (おとうと) (younger brother — standard), 兄貴(あにき) (big brother/boss), 子分(こぶん) (follower, henchman).