never say much about sth; not elaborate;not speak in detail ? 至于和徐世昌的來往進展，師傅們一概～。(愛新覺羅·溥儀《我的前半生》113) Although my tutors never said much about the negotiations that were going on between the palace and the president，…
語焉不詳yǔ yān bù xiánɡ
說得不詳細。not elaborate, not speak in detail, make only a bare of mention sth.