Restraint
Shackles, Restriction, Confinement, Binding
Bind a bundle of sticks to a person as a type of restraint. They can't get away when they're tied to a bunch of sticks, can they?
そくばく
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
彼氏の束縛が厳しいんだよね。
My boyfriend’s confinement is too severe.