|Origin:||cwellan 'to kill'|
to end a situation in which people are behaving violently or protesting, especially by using force [= put down]
quell the violence/disturbance/riot etc
Police used live ammunition to quell the disturbances.
to reduce or stop unpleasant feelings such as fear, doubt, or worry:
'Jerry?' she called, trying to quell the panic inside her.