To let go or get rid of as being useless or defective, for example
This one has a whole list of junk, chairs, tables, clothes.
You could stick the junk in a box and mail it a whole lot cheaper than having them fly out here.
Me, my whole world's a shopping cart full of junk and hand-me-downs—that's my life, all of it.
"Just some machinery junk," a patrolman muttered.
He had arranged for his passage in a Chinese junk, when he was again attacked by fever, and died on December 2nd, or, according to some authorities, November 27th, 1552.