had been piggybacking

• 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 piggyback.
  piggyback

  adverb

  on the back or shoulders.

Related Words

• add to
• amplify
• boost
• build up
• develop
• enhance
• enlarge
• expand
• heighten
• inflate
• intensify
• multiply
• reinforce
• strengthen