kissing cousin
表达两个人关系密切，但并非血亲的说法
口语·形容亲密但非正式关系
英文释义
someone who is closely related or closely connected, often in a way that is slightly suspicious or not entirely appropriate
例句
They're not siblings, but they're kissing cousins who spend all their time together.
典故来源
源自19世纪美国，指远亲间可亲吻的关系，后引申为关系密切但非血亲。