割襟之盟

Explanation: Cut lapel: pulp for the marriage, the respective cut skirts, treasure each other as a keepsake. Refers to the men and women before birth by their parents not to make the next engagement. 　　Source: "Yuan History Study of Law, two marriage" all men and women proposed marriage, there is engagement with fingertips were cut Gum, ban it. " 　　Examples: The two ~, is the fruit, but his family has been absolutely and Industry, Musical encountered, is the quiet government, think long-cherished wish of. (Mingling 濛 beginning "of half an hour Pai An Jing Qi" thirty-back)