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
Use a pencil to mark the openings exactly, then double-check that the openings
  are the correct width.
The scientists wanted to double-check these findings, and they did so in an
  interesting way.
These are humbling results, so the scientists decided to double-check them in a
  different way.
But then it's too late to repeat critical manipulations, to double-check
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