LATIN DICTIONARYLexicon Latīnum
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“quench” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

quench
restinguere: exstinguere (generalterm, as well of fire as of lime and thirst): compescere (to put out, of fire): opprimere (to put out or down; e.g., fire, flame, etc.). (The words are found in this connection and order.) exstinguere et opprimere; explere: sedare: reprimere: depellere (to still; e.g., one’s thirst) [Vid: also, To EXTINGUISH, To ALLAY]: to quench one’s thirst, sitim explere, etc. [Vid: SYN. above]: to quench one’s thirst by a drink of cold water, sitim haustu gelidae aquae sedare: he is only permitted to quench his thirst with water, potione aquae tantum a siti vindicari debet.
To destroy, Vid: QUENCHLESS, Vid: UNQUENCHABLE.

Quick answer

What is the Latin word for quench?
The usual Latin words for “quench” are restinguō, exstinguō, compescō; also opprimō, expleō, sēdō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.