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. Unabridged


verb (used with object), verb (used without object)
to check twice or again; recheck.
a second examination or verification to assure accuracy, proper functioning, or the like.

1950–55, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To double check
World English Dictionary
1.  to check twice or again; verify
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
If people are going to make comments on articles, they should provide where
  they got their sources, and double check their work.
Heck new airport scanner generate biometric could double check shirt and shoes
  are the correct size.
Oh, one thing double check the address they have for you.
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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