had been slitting

• 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 slit.
  slit

  verb (used with object)

  to cut apart or open along a line; make a long cut, fissure, or opening in.

Related Words

• aperture
• cleavage
• crevice
• fissure
• incision