Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A sale of used household belongings, typically held outdoors or in a garage at the home of the seller.
Wiktionary
WordNet 3.0
- n. an outdoor sale of used personal or household items held on the seller's premises
Etymologies
- From garage sale (Wiktionary)
Examples
“Judy Hamilton, client manager of the outplacement firm of Schoenberg Associates in Indianapolis, tells of one recently fired client who went to a garage sale and bought a set of old dishes.”
Lists
These user-created lists contain the word ‘garage sale’.
Tweets
Looking for tweets for garage sale.

seanahan I'd call it a garage sale if the stuff is in the garage (or driveway) and a yard sale if the stuff is in the yard. If neighbors are simultaneously holding sales, it could also be a block sale.
In Dallas Texas, there are a lot of "Estate sales". Apr 25, 2008
pterodactyl See this map of American usage. Apparently, in the US, "garage sale" is more common in the north than in the south (except for Texas, for some reason). Apr 22, 2008
treeseed A garage sale, also called a "yard sale", "tag sale", "attic sale", "moving sale", or "junk sale", is an informal, irregularly scheduled event for the sale of used goods by private individuals.
_Wikipedia
See also rummage sale
White elephant sale
In Wales I have heard these sales called boot sales and jumble sales Feb 3, 2008