double check

/D AH1 B AH0 L CH EH0 K/
verb
  1. 1

    (transitive) To check a second time; to check twice with extra caution or attention; to verify or make sure.

noun
  1. 1

    A second check or verification, usually with additional caution or attention.

  2. 2

    (chess, countable, uncountable) A check delivered by two pieces simultaneously.