投桃報李 [－－报－]

Jyutping tau4 tou4 bou3 lei5
Pinyin tóu táo bào lǐ

Definitions (CC-CEDICT)
  1. toss a peach, get back a plum (idiom); to return a favor
  2. to exchange gifts
  3. Scratch my back, and I'll scratch yours.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to return a favor; to exchange gifts; you scratch my back and I'll scratch yours.
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）