To quench or extinguish, especially to cool heated metal by plunging it into water.
From Old English 'cwencan' (to quench) combined with 'aqu-' prefix (from Latin 'aqua' meaning water), suggesting the water-based quenching process. This is an archaic or obsolete form.
Aquench is an example of how old English combined prefixes and roots in ways we've mostly forgotten—blacksmiths would absolutely have used this term when describing the dramatic sizzle and steam of plunging white-hot metal into water to harden it.
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