金兰之契

Explanation: Gold: metaphor Jian; Blue: metaphor, Hong; Lease: catered. Refers to the friendship appeals to friends. 　　Usage: Partial official; as object; that a friend or sworn brothers fall in love 　　Source: "Book of the copulative": "two concentric, the benefit cut through metal; concentric words, the smell, such as blue." Thesaurus:  a friend until death, A friend in need is a friend indeed., ties between friends willing to sacrifice even life for each other, The world is but a little place, after all., Very friendly Heart, click, Qingshenyihou, Yi Results sworn brothers and sisters Antonym Group:  only slightly acquainted with (a person), have met only once, Side of the Ya, To sever friendship Sub-Block, Guan Ning to sever friendship