Quench means stopping the reaction by cooling it down and or diluting and or neutralizing the acid.
Usually you pour the reaction into water or let cool down and pour into bicarbonate solution and then wash.
Now, in another thread, the roguelab character recommended to the zeko to quench with a mixture of methanol and KOH. This sounds like it would introduce something unnecessarily bad and give it a colour as well.
But this thread Azulene, Acidic Distillation, The Mystery Blue at some point is about neutralizing an acidic crude before distillation and someone also recommends a mixture of ethanol and NaOH, because it makes a “non-nucleophilic organicish acid” and that is good for some unspecified reason.
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