was cross-indexing

• past progressive

  past progressive

  Used to describe an ongoing action or continuous state that was happening at a specific time in the past.

  of cross-index.
  cross index

  noun

  a note or group of notes referring the reader to material elsewhere.

More Suggestions

• cross index
• cross-bedding
• cross-breeding
• cross-dating
• cross-carpeting
• cross-cutting
• cross-dressing
• cross-posting
• cross-string