Definition of tie-on:
(n) :
A knot; a fastening.
(n) :
A knot of hair, as at the back of a wig.
(n) :
A necktie (item of clothing consisting of a strip of cloth tied around the neck). See also bow tie, black tie.
(n) :
A lace-up shoe.
(n) :
A twist tie, a piece of wire embedded in paper, strip of plastic with ratchets, or similar object which is wound around something and tightened.
(n) :
A connection between people or groups of people, especially a strong connection.