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Hand in : give homework,papers....etc to a teacher

Hand out: To distribute or give. 
            The teacher hands out worksheets to the students. 

Hang about :To linger or wait around. 
            He likes to hang about in the park after school. 

Hang around: To spend time in a place without any specific purpose. 
           We used to hang around the mall when we were teenagers. 

Hold on : To wait or remain on the line. 
            Please hold on while I transfer your call. 


Hang on  : To keep something

When everyone else was getting fired, Paul managed to hang on to his job.

Hang out  : To spend time with someone, casually

My friends and I used to hang out in the park after school.

Hang up : To end a phone call, especially if before the other person is ready

I was in the middle of a sentence, and he hung up on me! How rude.

Hold on  (a) : To hold something tightly

You’d better hold on to your hat; it’s windy out there!

              (b) — To ask someone to wait for a moment

               Hold on, I’ll be right back.


Hold back  : To stop yourself from doing or saying something

Amy has a great voice, but whenever she’s singing in public, she feels shy and holds back