tear gas noun
[noncount] : a gas that makes people unable to see by causing their eyes to be filled with tears and that is used especially by the police or military to separate large groups of people
— tear·gas 
/ˈtiɚˌgæs/ verb, tear·gas·ses; tear·gassed; tear·gas·sing [+ obj]
▪ The protesters were teargassed by the police.
/ˈtiɚˌgæs/ verb, tear·gas·ses; tear·gassed; tear·gas·sing [+ obj] ▪ The protesters were teargassed by the police.
