1 [stawnch, stanch, stahnch]
verb (used with object)
to stop the flow of (a liquid, especially blood).
to stop the flow of blood or other liquid from (a wound, leak, etc.).
Archaic. to check, allay, or extinguish.
verb (used without object)
to stop flowing, as blood; be stanched.
Also called flash-lock, navigation weir. a lock that, after being partially emptied, is opened suddenly to send a boat over a shallow place with a rush of water.
Also, staunch.

1275–1325; Middle English stanchen, staunchen (v.) < Old French estanchier to close, stop, slake (thirst) < Vulgar Latin *stanticāre, equivalent to Latin stant- (stem of stāns, present participle of stāre to stand) + -icāre causative suffix

stanchable, adjective
stancher, noun
unstanchable, adjective Unabridged


2 [stawnch, stahnch, stanch]
adjective, stancher, stanchest.

stanchly, adverb
stanchness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stanch or staunch (stɑːntʃ, stɔːntʃ)
1.  to stem the flow of (a liquid, esp blood) or (of a liquid) to stop flowing
2.  to prevent the flow of a liquid, esp blood, from (a hole, wound, etc)
3.  an archaic word for assuage
4.  a primitive form of lock in which boats are carried over shallow parts of a river in a rush of water released by the lock
[C14: from Old French estanchier, from Vulgar Latin stanticāre (unattested) to cause to stand, from Latin stāre to stand, halt]
staunch or staunch
[C14: from Old French estanchier, from Vulgar Latin stanticāre (unattested) to cause to stand, from Latin stāre to stand, halt]
'stanchable or staunch
'staunchable or staunch
'stancher or staunch
'stauncher or staunch

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"to stop the flow of" (esp. blood), c.1300, from O.Fr. estanchier "cause to cease flowing, stop, hinder," from V.L. *stancare, perhaps contracted from *stagnicare, from L. stagnum "pond, pool" (see stagnate).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Fletcher was a stanch supporter of the colonial aristocracy, and bitterly
  opposed to the popular party.
Concerned colleges try to stanch flow of cheap beer.
The official response to the violence was more than an attempt to stanch the
  blood-letting in a struggling old industrial city.
His immediate challenge is to stanch the flow of oil.
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