Definition of Double-check

Babylon English Dictionary
inspect or check again, look over a second time, check twice
inspected or checked again, looked over a second time, checked twice
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Double-check Definition from Language, Idioms & Slang Dictionaries & Glossaries
ENGLISH IDIOMS 2.EDITION
check again to be sure something is correct He double-checked the price of the airplane ticket.
WordNet 2.0

Noun
1. something that checks the correctness of a previous check
(synonym) countercheck
(hypernym) assay, check
(derivation) double-check

Verb
1. check once more to be absolutely sure
(hypernym) see, check, insure, see to it, ensure, control, ascertain, assure
(derivation) countercheck, double check
Double-check Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In chess, a double check is a check delivered by two pieces at the same time. In chess notation, it is sometimes symbolized by "++".

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Double-check Definition from Sports Dictionaries & Glossaries
Glossary of Chess Terms
A simultaneous check given by moving one piece to give check, thereby also unmasking another piece which also gives check.