ㄊㄢˊtánㄍㄨˇㄌㄨㄣˋlùnㄐㄧㄣjīn

  1. 話題廣泛題材旁及古今中外偶爾三五好友相聚天南地北談古論今真是人生樂事。」論今說古」。

to talk of the past and discuss the present (idiom)​, to chat freely, to discuss everything