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gaydar

noun
🔊/ˈɡeɪdɑː(r)/
🔊/ˈɡeɪdɑːr/
[uncountable] (informal)
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  1. the ability that a gay person is supposed to have to recognize other people who are gay同性恋雷达（同性恋者识别其他同性恋者的能力）
    Word Origin1980s: blend of gay and radar.