• 【解释】:古时订立盟约,要在嘴上涂上牲口的血。指订约不久就毁约。【出自】:《左传·襄公九年》:“与大国盟,口血未干而背之,可乎?”【示例】:~,宋人背盟,寡人伐之。◎明·冯梦龙《东周列国志》第十一回【语法】:主谓式;作谓语、宾语;指订盟约不久就毁约..

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