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Jyutping gwaan1 hai6 wu6
Pinyin guān xì hù

Definitions (Wiktionary)
  1. noun, Mainland-China
    one's connection (from whom one can gain special advantage or benefit)

關係戶 [关系户]

Jyutping
Pinyin guān xi hù

Definitions (CC-CEDICT)
  1. a connection (sb with whom one has dealings on the basis of "scratch my back and I'll scratch yours")