心照不宣

Explanation: According know; declare publicly what. Knew each other, rather than publicly speak out. 　　Usage: -Linked; as predicate, attributive, adverbial; that there is a tacit understanding with each other 　　Source: Jin Pan, "Jaap Attendants Dirge" tacit commune, only I and son. "Made after a tacit understanding." 　　Examples: Oh, Oh, I suppose I say, you are old threshold, we have ~, is not it! ★ Mao Dun "Midnight" Eleventh 　　Results: Chest hanging lanterns 　　Postscript: Chest hanging lanterns 　　Riddle: Default; perspective Conclusion confidential Thesaurus:  omniscient, tacit understanding, boson friends, know sth. as a person knows his ten fingers, as if enumerating one's family valuables— very familliar with one's subject, To understand clearly Into the Huai, understand tacitly; I appreciate your kindness, Minds think alike, knowing one's own situation and that of the enemy, Several chest, Zhibi confidant