Gag

gag
verb, transitive. To put a gag on someone. To prevent someone from speaking freely or disseminating information. To choke or retch. Also a noun, usually referring to a piece of cloth, put in or over a person't mouth to prevent speaking or crying out.

The odor was faint when Amy reached her desk the Tuesday morning after the holiday. She took the case containing her "computer glasses" out of her tote, then paused, sniffing. Something had died in her office over the weekend. Leaving the computer off for the moment, she began to look: behind the desk, against the wall, on the credenza shelves, inside the desk drawers.... She got down on her hands and knees so she could survey the floor beneath the furniture. Nothing but a couple of dust bunnies. This was not good. If the little corpse was inside the wall, there was no way to extract it and get it out of the building before the smell became more powerful. Amy had grown up on a farm and knew what was in store for her. She did her best to prepare: she opened the vent in the celing, even though she knew she would spend the day shivering as the chilly air blew on her. It was worth it to blow the smell away. "Tomorrow," she promised herself, "I'll bring my sweater and a jar of Vicks to dab under my nose." Today, she knew, all she would be able to do was endure it. "Endure" was correct: by early afternoon, the odor was strong enough to make her gag.

Definitions adapted from The New Oxford American Dictionary, Oxford University Press, Inc., 2005 (eBook Edition, copyright 2008), and from Webster's Seventh New Collegiate Dictionary, G. & C. Merriam Company, Publishers, Springfield, Massachusetts, USA, 1965, depending on which is more convenient to hand.