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Synonyms for Stifle (same or very similar meaning)

WordNet sense 1 (joint between the femur and tibia in a quadruped; corresponds to the human knee):
knee

WordNet sense 2 (conceal or hide):
muffle, repress, smother, strangle, repress

WordNet sense 3 (impair the respiration of or obstruct the air passage of):
asphyxiate, choke, suffocate

WordNet sense 4 (smother or suppress):
dampen


From the ODE community, based on WordNetadd/edit