/hang"on', -awn'/ , Informal.
n.
1. something easily attached to or mounted on another surface or object, as a turbocharger or transceiver in an automobile, a unit suspendable from shelving, or a portable soap dish.
adj.
2. pertaining to or denoting such an attachment: A clumsy hang-on unit supplied the air conditioning.
[ n., adj. use of v. phrase hang on ]