Verb
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be asphyxiated
die from lack of oxygen
"The child suffocated under the pillow"
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impair the respiration of or obstruct the air passage of
"The foul air was slowly suffocating the children"
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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"