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Jyutping maai5 jat1 sung3 jat1
Pinyin mǎi yī sòng yī

Definitions (Wiktionary)
  1. phrase
    Synonym of 買一贈一/买一赠一 (mǎiyīzèngyī, “buy one and get one free”).
    (syn.) 买一赠一, 買一贈一

買一送一 [买---]

Jyutping
Pinyin mǎi yī sòng yī

Definitions (CC-CEDICT)
  1. buy one, get one free
  2. two for the price of one
Examples (粵典–words.hk)
  1. Cantonese
    因为雪糕有买一送一,搞到要排三个钟队去食呀?真系攞苦嚟辛呀!
    因為雪糕有買一送一,搞到要排三個鐘隊去食呀?真係攞苦嚟辛呀!
    jan1 wai6 syut3 gou1 jau5 maai5 jat1 sung3 jat1, gaau2 dou3 jiu3 paai4 saam1 go3 zung1 deoi2 heoi3 sik6 aa3? zan1 hai6 lo2 fu2 lai4 san1 aa3!
    • Now we have to stay in the queue for three hours just for the buy-one-get-one-free ice cream? What a pain!
  2. Cantonese
    买一送一?老虎蟹都买多啲!
    買一送一?老虎蟹都買多啲!
    maai5 jat1 sung3 jat1? lou5 fu5 haai5 dou1 maai5 do5 di1!
    • Buy one get one free? I'll definitely buy more of them!
  3. Cantonese
    买一送一,勿失良机。
    買一送一,勿失良機。
    maai5 jat1 sung3 jat1, mat6 sat1 loeng4 gei1.
    • Buy one get one free! Don't let the good chance slip!
Examples (Wiktionary)
  1. Mandarin
    买一送一
    買一送一
    mǎi yī sòng yī
    • buy one get one (free)