double check

"Check and double check on that, sir," Dawson said respectfully.

"Just as well to have a double check nonetheless," Dane said.

No double check 'cause it's over a mile from Building A—outside the safety perimeter.

The check laid on the efflorescence of the religious instinct was a double check on the efflorescence of art.

But the troops in the centre were robbed of decisive victory by a double check on the wings.

“Double check” means attacking the king at once with two pieces—one of the pieces in this case giving check by discovery.

The third species of check is named the double check, where the King is attacked both by the Piece moved and the one discovered.

This aptly illustrates what I have already said as to the extra danger of a double check.

"Check, and double check," Dave echoed, and started up the steps of the Operations Office.