chia̍h-sin-siûⁿ食新囚

to bully the new prisoner in prison

to bully the new prisoner in prison (of an older prisoner); to bully the newbie (of a veteran)

by extension

English Wiktionary, “食新囚” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E9%A3%9F%E6%96%B0%E5%9B%9A · confidence: Medium (Wiktionary)