What is meaning of Hook up?
Please give me some explanation about the sentences below:- When you hook up with you ex.- Hook me up if there's a good person.- What girls do before hooking up

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Meaning for sentence 1 and 3: To have sex with someone you are not in a relationship with. Similar meaning to "one night stand".

The meaning in sentence 2 is similar to "help me if you are able" For your sentence, it would be something like "if you know a good person, help me by and introducing us." It is making a request for something.

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Helo, i'm new here!

How are you ?

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Hi Mina! Hook-Up is an informal phrase. It means ,meet or form a relationship.