IPA: /ˈkwɛn.tʃər/
KK: /ˈkwɛnʧər/
A thing that satisfies thirst or puts out a fire.
Water is the best quencher for your thirst on a hot day.
Quencher is formed from "quench" (from Old English *cwencan*, meaning to extinguish or put out) and the suffix "-er" (meaning a person or thing that performs an action). The word "quencher" refers to something that extinguishes thirst or satisfies it.
Think of something that 'extinguishes' thirst — that's what a 'quencher' does, just like how 'quench' means to put out.