How to Say "to quell" in Spanish
The Spanish word for “to quell” is “reprimir” — C1 level.
English → SpanishC1
verbC1formal
stopping a rebellion or protest

Examples
El ejército reprimió la rebelión en pocos días.
The army quelled the rebellion in a few days.
Es ilegal reprimir las protestas pacíficas.
It is illegal to suppress peaceful protests.
Subject and Object
In this context, the person or group doing the 'quelling' is usually an authority (government, police), and the object is the event or group being stopped.
Related Translations
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