From Longman Dictionary of Contemporary Englishdouble-checkˌdouble-ˈcheck verb [intransitive, transitive] CHECK/MAKE SUREto check something again so that you are completely sure it is correct, safe etc► see thesaurus at check→ See Verb table
Examples from the Corpus
double-check• "Did you switch the heating off?" "Yes, I double-checked."• I don't think I made a mistake. I checked and double-checked all my calculations.• Double-check that all the information was copied correctly.• Double-check that the computer file was properly copied.• It was asked to provide the most inclusive list and leave it to the county officials to double-check the names. 