Asphyxiating

to produce in.
to cause to die or lose consciousness by impairing normal breathing, as by gas or other noxious agents; choke; suffocate; smother.
to become asphyxiated.
Contemporary Examples

So they spent eight years taking the humming economy they inherited and asphyxiating it.
Michael Tomasky on the GOP’s Economic Sabotage Michael Tomasky February 5, 2012

The rest of the train will now be even more packed and asphyxiating.
‘Stupid Enough to Pay’: Tim Parks’s Italian Rail Adventures Tim Parks June 22, 2013

Historical Examples

The asphyxiating ball of the French was the true parent of the whole brood.
Curiosities of Civilization Andrew Wynter

They followed the cannonade with a cloud of asphyxiating gas.
The Story of the Great War, Volume III (of VIII) Various

And she said that it was unnecessary to have a dozen people breathing up all the oxygen and asphyxiating the patient.
When a Man Marries Mary Roberts Rinehart

Yes, he would go to Germany and study medicine and escape this asphyxiating atmosphere.
Dreamers of the Ghetto I. Zangwill

The room was asphyxiating, but no one except Audrey seemed to be inconvenienced.
The Lion’s Share E. Arnold Bennett

Another form of asphyxiating gas is held in shells in liquid form, usually in lead containers.
Italy at War and the Allies in the West E. Alexander Powell

It would only be an asphyxiating gas that would knock a man out for a while.
The Red Watch J. A. Currie

It is really, however, the most efficacious of the three types, as it does not evaporate as readily as the asphyxiating gas.
Italy at War and the Allies in the West E. Alexander Powell

verb
to cause asphyxia in or undergo asphyxia; smother; suffocate
v.

1818, “to suffocate” (someone or something), from asphyxia + -ate (2). Related: Asphyxiated; asphyxiating.

asphyxiate as·phyx·i·ate (ās-fĭk’sē-āt’)
v. as·phyx·i·at·ed, as·phyx·i·at·ing, as·phyx·i·ates
To induce asphyxia.
as·phyx’i·a’tion n.