Asphyxiate

as·phyx·i·ate /æsˈfɪksiˌeɪt/ Pronunciation Key - Show Spelled Pronunciation[as-fik-see-eyt] Pronunciation Key - Show IPA Pronunciation verb, -at·ed, -at·ing. –verb (used with object)

1.to produce asphyxia in.

2.to cause to die or lose consciousness by impairing normal breathing, as by gas or other noxious agents; choke; suffocate; smother. –verb (used without object)

 3.to become asphyxiated.

[Origin: 1830–40; asphyxi(a) + -ate¹]