莫逆之交

Explanation: Intimate: no conflict, feelings of harmony; delivery: communication, friendship. Means very good friends. 　　Usage: Partial official; as object; with compliment 　　Source: Qin Zhuang, "Great Master Zhuang": "Three to smile, intimate in mind, then phase as a friend." 　　Examples: Cui Hao less and is ~. ("History of Sui Northern boast Biography") 　　Riddle: Shun Love Thesaurus:  omniscient, tacit understanding, have a tacit understanding; give tacit consent; tacit understanding, 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