空口說空話 [－－说－话]

Jyutping hung1 hau2 syut3 hung1 waa6
Pinyin kōng kǒu shuō kōng huà

Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 空口說白話／空口说白话 (kōngkǒu shuō báihuà, “to make empty promises”).
    (syn.) 空口说白话, 空口說白話