thigh, crotch
股 centers on the upper leg and the area where the legs meet the body: the thigh and the crotch.
股 combines ⺼ (flesh) with 殳, which likely contributes the sound. The character originally referred to the thigh or upper leg.
The left side ⺼ is flesh, and the right side 殳 looks like a tool or weapon. Picture a warrior's thigh, strong and muscular, as the fleshy part that supports action.
For コ, imagine a co-worker slapping their thigh while laughing: co -> コ, and the thigh is the fleshy part being slapped.
crotch; groin; area between the thighs
groin; thigh; crotch; crutch
hip joint; coxa
seeing two people (i.e. romantically) at the same time; two-timing
bare thighs; inner thigh
inner thigh; inside of the thigh
wrestler's ceremonial leg raising and stomping
spreading one's legs wide apart; straddle
inseam; inside leg
forked stick
close fitting trousers; working trousers; long johns; long underpants
bowlegs; bandy legs
vulva; female genitals; female genital area
to two-time; to play it both ways; to sit on the fence
to cheat (in a romantic relationship)
double-dealer; timeserver; moving back and forth between two sides in a conflict
artificial hip; hip prosthesis
artificial hip replacement surgery
congenital dislocation of the hip; developmental dysplasia of the hip
eight-legged essay (classical Chinese style of essay writing)