Deprive of oxygen and prevent from breathing. Synonyms:smother, suffocate."The child suffocated herself with a plastic bag that the parents had left on the floor"
2.
Impair the respiration of or obstruct the air passage of. Synonyms:choke, stifle, suffocate.
3.
Be asphyxiated; die from lack of oxygen. Synonyms:stifle, suffocate.
... occasionally and firing down on us as well as they could with their clumsy muskets and pistols—a fire which we just as promptly returned, aiming wherever we saw a flash. They once pitched in one of their terrible fire balls or "stink-pots" of fulminating stuff to asphyxiate us with its beastly smell; but Tim Rooney, taking hold of it and plunging the obnoxious thing in a bucket of water, rid us at once of the ... — Afloat at Last - A Sailor Boy's Log of his Life at Sea • John Conroy Hutcheson