WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds
verb.
attack with teargas; subject to teargas fumes
Word Usage
"At some stage when I heard what I can say are shots.] [I] t was in the process, because when teargas is fired I think it gives the same sound as of bullets."