絞 （コウ） death by hanging (punishment in the ritsuryō system)

絞殺 （コウサツ） strangulation, strangling

絞る （しぼる） to wring (towel, rag), to squeeze, to squeeze (fruit to extract juice), to press, to extract, to milk, to express milk, to rack (one's brains), to strain (one's voice), to extort, to exploit, to chew out, to reprimand severely, to rake over the coals, to give a sound scolding, to tell someone off, to scold, to rebuke, to drill into, to train, to narrow down (one's focus), to whittle down, to gather up (curtain, etc.), to tighten (drawstring), to stop down (lens), to turn down (e.g. radio), to bend (bow), to draw, to hold down, to constrict, to immobilize

絞める （しめる） to strangle, to constrict

絞まる （しまる） to be strangled, to be constricted