buy one get one free
 

* 1.purchase one item and receive the second one for free

English Related Words* a free

* a free hand

* a game one

* a hundred and one

* a hundred to one chance

* a one

* a one way ticket, please

* a quick one

* a short one

* a tall one

* a wild one

* abstract syntax notation one (asn.1)

* accident free

* acid free

* act one