WordNet sense 1 (conceal or hide):

muffle, repress, smother, stifle, repress

WordNet sense 2 (kill by squeezing the throat of so as to cut off the air):

strangulate, throttle

WordNet sense 3 (prevent the progress or free movement of):

cramp, halter, hamper, halter

WordNet sense 4 (constrict (someone's) throat and keep from breathing):

choke

WordNet sense 5 (struggle for breath; have insufficient oxygen intake):

gag, suffocate