KanjiJLPT N3
Harm

harm, injury

Mnemonic

Under the roof, a sheep opens its mouth and gnaws through every support beam, causing catastrophic harm to the building. The roof groans and collapses while the sheep just keeps chewing, mouth full of splinters.
Additional thoughts
Picture the kanji top-down: roof on top, sheep in the middle chewing destructively, mouth at the bottom still gnawing. The sheep trapped under the roof devours the structure from within—pure harm.
Quick recall
A sheep under a roof opens its mouth to chew through beams, causing total harm.

Details

The keyword for 害 is harm. This kanji conveys the idea of damage, injury, or something detrimental that causes suffering or loss. It encompasses both physical and abstract forms of harm, including harm to people, property, or well-being. It is widely used in contexts relating to disaster, obstruction, and negative effects that impede or destroy.
On'yomi
がい

Used in kanji