stifle
noun.
joint between the femur and tibia in a quadruped; corresponds to the human knee
Synonym: knee
verb.
suppress in order to conceal or hide
smother a yawn|muffle one's anger|strangle a laugh|repress a cry of fear
verb.
suppress or constrain so as to lessen in intensity
Stifle your curiosity
Synonym: dampen
verb.
impair the respiration of or obstruct the air passage of
The foul air was slowly suffocating the children
verb.
be asphyxiated; die from lack of oxygen
The child suffocated under the pillow
Antonym: stimulate