ㄉㄚˇㄉㄜ˙deㄏㄨㄛˇhuǒㄖㄜˋ

  1. 形容關係極度密切水滸傳·》:原來建康一個煙花娼妓如常往來正是打得火熱。」老殘遊記·第一》:浪子按察南胡土娼銀子打得火熱。」

to carry on intimately with (idiom)​; ardent relationship (esp. between lovers)​, billing and cooing