had been derailing

• 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 derail.
  derail

  verb (used with object)

  to cause (a train, streetcar, etc.) to run off the rails of a track.

Related Words

• block
• deter
• filibuster
• hamper
• hinder
• impede
• interfere
• stall
• stonewall
• thwart