Other forms: quelled, quelling
To quell is to put an end to a rebellion or a fear. Quell the riot, quell the rumours, quell his doubts.
It takes trouble as its object — riots, unrest, fears, doubts — and it means suppressing rather than resolving, which is why quelling a rebellion says nothing about the grievance behind it. It is formal. Note that the Old English verb meant simply to kill, which is a good deal blunter.
1verbquellTo put an end to a rebellion or a fear.
“Police were sent in to quell the riot.”
quell is a suppressing.
Old English cwellan means to kill. The sense weakened to suppressing rather than killing.
Middle English
quellen
English, today
quell
From Middle English quellen. From Middle English quellen, from Old English cwellan (“to kill”), from Proto-West Germanic kwalljan, from Proto-Germanic kwaljaną (“to make die; kill”), ultimately from Proto-Indo-European gʷelH-. Cognate with German quälen (“to torment; agonise; smite”), Swedish kvälja (“to torment”), Icelandic kvelja (“to torture; torment”). Compare also xcl կեղ (“sore, ulcer”), cu жаль (“pain”). See also kill, which may be its doublet.
Etymology from Wiktionary, CC BY-SA