害
ガイ

harm, injury

JLPT3 G4 S10 F358

The relevant bronzeware inscription form combines 丯# as described in 契 (cut through and separate) + 口 mouth → *harm* or *damage* caused by something cut/bitten through and thus separated → *prevent*/*hinder* (← prevent/hinder by separating). In the derivative characters 瞎 and 豁, the lower vertical stroke of 害 extends down to the 口 element.

[Full Kanji Etymology List]