had been cross-checking

• past perfect progressive

  past perfect progressive

  Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.

  of cross-check.
  cross-check

  verb (used with object)

  to determine the accuracy of (something) by checking it with various sources.

Popular Searches

• ASAP
• collage
• breakcore
• factoid
• teleportation
• double-edged sword
• prolific