Etymology
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stanch (v.)

"to stop the flow of" (especially of blood), early 14c., from Old French estanchier "cause to cease flowing (of blood), stop, hinder; extinguish (of fire); tire, exhaust, drain" (Modern French étancher), from Vulgar Latin *stancare, perhaps contracted from *stagnicare, from Latin stagnum "pond, pool" (see stagnate). But Barnhart says it probably is from Latin stantio, present participle of stare "to stand."

updated on November 21, 2013

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Definitions of stanch from WordNet

stanch (v.)
stop the flow of a liquid;
Synonyms: stem / staunch / halt
From wordnet.princeton.edu, not affiliated with etymonline.