Hold on. I'll just go and get him for you.

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In this sentence, what is the meaning of 'get'?

[situation]
A person called. And the answerer answers the phone. The answerer wants to hand the telephone to the right person.

Get in that sentence means that the answerer will bring the person to the phone (or hand the phone to the right person).

i will go to him and give the phone to him

In the given situation, the word "get" is used to refer to the action of retrieving or fetching someone. In this context, it means that the answerer is going to find and bring the person who is being asked for to the phone. The purpose is to connect the caller with the desired person, usually to have a conversation or to pass on a message.