=she is such a big mouth. She's always gossiping
To have a shoulder to cry on
=It is always good to have a best friend because he can be your shoulder to cry on
To be on last legs
=my grandpa is on his last legs. He is not the same as he used to be
To hit the nail on the head
=you are so smart. You always hit thr nail on the head
To get it off your chest
=I have to get this off my chest. I love you ^^
