double check

noun Chess.
a simultaneous check by two pieces in which the moving of one piece to give check also results in discovering a check by another piece.
Dictionary.com Unabridged

dou·ble-check

[duhb-uhl-chek]
verb (used with object), verb (used without object)
1.
to check twice or again; recheck.
noun
2.
a second examination or verification to assure accuracy, proper functioning, or the like.
Origin:
1950–55, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To double check
00:10
Double check is always a great word to know.
So is ort. Does it mean:
a gadget; dingus; thingumbob.
a scrap or morsel of food left at a meal.
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Collins
World English Dictionary
double-check
 
—vb
1.  to check twice or again; verify
 
—n
2.  a second examination or verification
3.  chess a simultaneous check from two pieces brought about by moving one piece to give check and thereby revealing a second check from another piece

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Example sentences
So double check what they deliver, never let them near vital information and
  never give them credit.
Double check your bank account for errors and omissions.
When booking your train ticket, double check that your arrival and departure
  stations are the correct stations within each city.
Double check with the company, and also have them check next reading to make
  sure no one has messed with the meter.
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