虐

Kanji: 虐
Level: N1
Meaning: tyranny
On'yomi: ギャク
Kun'yomi: し虐.げる
Strokes: 9
Common compounds: 虐殺 (ぎゃくさつ, massacre) 虐待 (ぎゃくたい, abuse)
Memory hook: A tiger (虎) using tyranny (虐) to oppress others.