had been subverting

• 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 subvert.
  subvert

  verb (used with object)

  to overthrow (something established or existing).

Related Words

• corrupt
• debase
• overthrow
• overturn
• pervert
• poison
• sabotage
• supersede
• suppress
• topple
• undermine
• vitiate