the green-eyed monster
noun/ðə ˌɡriːn aɪd ˈmɒnstə(r)/
/ðə ˌɡriːn aɪd ˈmɑːnstər/
(informal)- used as a way of talking about being jealous (= angry or unhappy because somebody has something you wish you had or because somebody you love shows interest in somebody else)
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the green-eyed monster