verbs
envelop completely
"smother the meat in gravy"
deprive of oxygen and prevent from breathing
"Othello smothered Desdemona with a pillow"; "The child suffocated herself with a plastic bag that the parents had left on the floor"
conceal or hide
"smother a yawn"; "muffle one's anger"; "strangle a yawn"
form an impenetrable cover over
"the butter cream smothered the cake"
is a type of (narrower)
form a cover over
"The grass covered the grave"
deprive of the oxygen necessary for combustion
"smother fires"