had been unbinding

• 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 unbind.
  unbind

  verb (used with object)

  to release from bonds or restraint, as a prisoner; free.

More Suggestions

• half-binding
• edition binding
• egg-binding
• half binding
• nonbinding
• sewn binding
• time-binding