劍橋詞典buy one get one free : an offer used in shops , in which if you buy one thing, you get another of the same thing for no extra cost 買(mǎi)一送一（商店的一種促銷(xiāo)方法，顧客購(gòu)買(mǎi)一件商品，就能免費(fèi)獲得另一件同樣的商品，buy one get one free 的縮寫(xiě)） 返回 BOGOF