had been permeating

• 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 permeate.
  permeate

  verb (used with object)

  to pass into or through every part of.

Related Words

• imbue
• impregnate
• infiltrate
• infuse
• invade
• pass through
• penetrate
• percolate
• pervade
• saturate
• seep
• steep
• suffuse