1. past tense of quell; to suppress or put an end to (a rebellion, disorder, or unrest), typically by the use of force
2. past tense of quell; to calm or reduce (fear, anxiety, or other strong emotion)

Examples

• The police quickly quelled the riot before it spread to other neighborhoods.
• The government quelled the rebellion with military force.
• Her reassuring words quelled my fears about the surgery.
• The teacher quelled the classroom disruption with a stern look.
• The CEO’s announcement quelled rumors about layoffs.
• Rain quelled the forest fire that had burned for days.
• The medicine quelled his nausea within an hour.