KanjiJLPT N1
Thigh

thigh, crotch

Mnemonic

By the pale light of the moon, a warrior swings a tomahawk that bites deep into his rival's thigh. The blade splits the thick muscle the way a trunk forks into two branches. Under the moon, blood streams down the thigh as the tomahawk stays lodged in bone.
Additional thoughts
Moon (月) is on the left, Tomahawk (殳) on the right. Picture the moonlit scene vividly—the tomahawk embedding where the leg is thickest. The forking image ties to how thighs diverge from the torso.
Quick recall
A moonlit tomahawk strike splits a warrior's thigh wide open.

Details

The keyword for 股 is thigh. This kanji refers to the upper part of the leg, specifically the area between the hip and the knee. It can also be used more broadly to describe a fork or branch that splits into two parts, much like the way the thighs diverge from the torso. In geometry, it is used to refer to the legs of a right triangle.
On'yomi
Kun'yomi
また、もも

Used in vocab