Gerund form functioning as a noun (usually uncountable)
Definitions
The act or process of stifling; the suppression or suffocation of something or someone. The stifling of free speech was condemned by international observers.
stiflegerund / present participle Used to describe oppressive heat or atmosphere that makes breathing difficult.
Definitions
Oppressively hot, stuffy, or causing difficulty in breathing. We tried to sleep in the stifling room.