What is the meaning of Thirl?

A hole, an aperture, especially a nostril.

A low door in a dry-stone wall to allow sheep to pass through; a smoot.

A short communication between adits in a mine.

A long adit in a coalpit.

To pierce; to perforate, penetrate, cut through.

To drill or bore; to cut through, as a partition between one working and another.

To throw (a projectile).

To legally bind (a tenant) to the use of one's own property as an owner.

To bind; to obligate to use or be associated with.

A thrall.

An aperture or hole, especially of the body:

  1. A nostril (aperture in the nose)
  2. A wound or gash; an opening from injury.
  3. A window or gap in a building or vessel.

A nostril (aperture in the nose)

A wound or gash; an opening from injury.

A window or gap in a building or vessel.

A private room.

Alternative form of thirlen

Source: wiktionary.org