Correct

买一送一

/ mǎi yī sòng yī /
Strokes

Definition

buy one, get one free/two for the price of one

Example

Definition

buy one, get one free; buy one and get one for free

1
Suǒyǒu
所有
shípǐn
食品
yǐnpǐn
饮品
mǎi
sòng
  
,
其他
shāngpǐn
商品
jūn
wéi
èr
第二
jiàn
bànjià
半价
  

Buy one get one free on food and drink products, and buy one get one half price on absolutely anything else.