1. (noun)stifle, knee joint between the femur and tibia in a quadruped; corresponds to the humanknee
2. (verb)smother, stifle, strangle, muffle, repress conceal or hide "smother a yawn"; "muffle one's anger"; "strangle a yawn"
3. (verb)stifle, dampen smother or suppress "Stifle your curiosity"
4. (verb)suffocate, stifle, asphyxiate, choke impair the respiration of or obstruct the air passage of "The foul air was slowly suffocating the children"
5. (verb)suffocate, stifle, asphyxiate be asphyxiated; die from lack of oxygen "The child suffocated under the pillow"