When someone gags, they are unable to breathe because they are too busy vomiting. Vomiting can cause a person to gag because the stomach acids are burning the throat.
She gagged and tried to breathe through her mouth, but it was no use.
The smell of the gas was so strong that it caused her to gag and vomit.
verb
To experience the vomiting reflex.
verb
To cause to heave with nausea.
verb
To restrain someone's speech by blocking his or her mouth.
verb
To pry or hold open by means of a gag.
verb
To restrain someone's speech without using physical means.
verb
To choke; to retch.
verb
To deceive (someone); to con.
noun
A gag motion or reflex.