Double-checking is an important step in any process, as it helps to ENSURE accuracy and completeness. The term double-check can be broken down into four crossword solutions: RETEST (6 letters), READD (5 letters), ENSURE (6 letters), and REEXAMINE (9 letters). RETEST means to test again, READD means to add back, ENSURE means to make sure, and REEXAMINE means to look at again. Together, these words suggest that double-checking involves testing, adding, making sure, and looking at something again in order to confirm accuracy and completeness.