had been superseding

• 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 supersede.
  supersede

  verb (used with object)

  to replace in power, authority, effectiveness, acceptance, use, etc., as by another person or thing.

Related Words

• annul
• overrule
• repudiate
• set aside
• supplant
• usurp