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
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Double-check is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
the offspring of a zebra and a donkey.
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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
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Example sentences
But then it's too late to repeat critical manipulations, to double-check
  something.
Use a pencil to mark the openings exactly, then double-check that the openings
  are the correct width.
That's why it's best to double-check with another way of measuring.
These are humbling results, so the scientists decided to double-check them in a
  different way.
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