stifle

[1]	suffocate , smother , choke , strangle , throttle , asphyxiate
[2]	choke back , smother , strangle , keep/hold back , withhold , muffle , repress , repress , suppress , hold in , restrain , prevent , curb , cover up , control
[3]	destroy , dampen , crush , demolish , extinguish , stamp out , kill , quash , silence , stop , check
[4]	suffocate , asphyxiate , choke
[5]	suffocate , asphyxiate

[1]

knee