'Junk shop' definitions:

Definition of 'junk shop'

noun

A shop that sells cheap secondhand goods

From: GCIDE

Junk \Junk\, n. [Pg. junco junk, rush, L. juncus a bulrush, of which ropes were made in early ages. Cf. Junket.] [1913 Webster]
1. Pieces of old cable or old cordage, used for making gaskets, mats, swabs, etc., and when picked to pieces, forming oakum for filling the seams of ships. [1913 Webster]
2. Old iron, or other metal, glass, paper, etc., bought and sold by junk dealers. [1913 Webster]
3. Hence: Something worthless, or only worth its value as recyclable scrap. [PJC]
4. (Naut.) Hard salted beef supplied to ships. [1913 Webster]
Junk bottle, a stout bottle made of thick dark-colored glass.
Junk dealer, a dealer in old cordage, old metal, glass, etc.
Junk hook (Whaling), a hook for hauling heavy pieces of blubber on deck.
Junk ring. (a) A packing of soft material round the piston of a steam engine. (b) A metallic ring for retaining a piston packing in place; (c) A follower.
Junk shop, a shop where old cordage, and ship's tackle, old iron, old bottles, old paper, etc., are kept for sale.
Junk vat (Leather Manuf.), a large vat into which spent tan liquor or ooze is pumped.
Junk wad (Mil.), a wad used in proving cannon; also used in firing hot shot. [1913 Webster]