A boot sale, also known as a car boot sale, is a popular outdoor market event where individuals and families sell second-hand goods from the boot of their cars or from tables. It's a great way to find unique items at affordable prices. If you're looking to expand your vocabulary, some synonyms for a boot sale are flea market, garage sale, jumble sale, tag sale, yard sale, rummage sale, and bazaar. These events are usually seasonal and are most popular during the summer months. So, if you want to have a bit of fun and grab a bargain or two, head on down to your nearest boot sale and see what treasures you can find!