Longman Dictionary of Contemporary English
Wiktionary
n. A shop to where goods are donated, and sold on at cheap prices, with all the profits going to charity
Wikipedia
A charity shop, thrift shop, thrift store (U.S. and Canada), hospice shop, resale shop (unless meaning consignment shop [U.S.]), drift store, opportunity shop or op shop (Australia and New Zealand) is a retail establishment run by a charitable organization to raise money.
Charity shops are a type of social enterprise. They sell mainly used goods donated by members of the public, and are often staffed by volunteers. Because the items for sale were obtained for free, and business costs are low, the items can be sold at competitive prices. After costs are paid, all remaining income from the sales is used in accord with the organization's stated charitable purpose. Costs include purchase and/or depreciation of fixtures (clothing racks, bookshelves, counters, etc.), operating costs (maintenance, municipal service fees, electricity, telephone, limited advertising) and the building lease or mortgage.
Usage examples of "charity shop".
They were subsequently delighted when the news broke that the vacant building would be used to house another charity shop.
He knew he needed to change his appearance: easily achieved with a visit to a charity shop.
She'd given every piece of that clothing to a charity shop in Stanground, along with the cheaper jewellery.
Kate couldn't bear to send the richly coloured cushions to the charity shop, and shoved them into a bin bag to take home with her, finding room for them on the passenger seat and fitting the seat belt round for good measure.