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WordNet (r) 3.0 (2006) (WordNet)

asphyxiate
v 1: 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" [synonym: {smother}, {asphyxiate}, {suffocate}]
2: impair the respiration of or obstruct the air passage of;
"The foul air was slowly suffocating the children" [synonym:
{suffocate}, {stifle}, {asphyxiate}, {choke}]
3: be asphyxiated; die from lack of oxygen; "The child
suffocated under the pillow" [synonym: {suffocate}, {stifle},
{asphyxiate}]