This idiom or expression has to do with:

Getting out of a bad legal situation without being punished.

A. Didn’t they arrest him for stealing from his mother?!
B. Yeah, but somehow he beat the rap and avoided going to jail!!

Also see:
Get away with something.

This idiom or expression is about:

Supporting someone.
Believing in someone.

I’m tired of being a quiet observer. Starting today, I’m standing up for victims of violence and their rights!

Also, see:
Taking a stand.

This idiom or expression means:

Slapping with the back of the hand.
Slapping not meant to hurt, but to show authority and to put the slapped person in his or her place.

Also see:
Jack slapping.

This idiom or expression like phrase means:

One’s spouse, girlfriend, boyfriend, etc.

A. I hear you have a new significant other.
B. Oh, yes, and she’s a lot more significant than you think!

Also see:
Better half.

This idiom or expression like phrase means:

Just printed.
Just reported.
Just announced.

A. Is that an old story?
B. No, it’s fresh off the press!! I just heard it on the radio.

This idiom or expression like phrase means:

A person who talks loudly.
A person who bothers people by talking with a loud voice.

This idiom or expression like phrase means:

Ready for, or in line for, something, as in:
This time I’m up for promotion.
Next year she’s up for re-election.

Interested in something or doing something, as in:
Are you up for some mountain climbing this weekend?

This idiom or expression has to do with:

Planning to do something.

I don’t usually see you at the office on weekends, but you’re here today! What are you up to?

This idiom or expression means:

A sexual intercourse.

A. You think they had a roll in the hay?
B. I don’t know, but they sure look dirty!!

This idiom or expression means:

Sizing someone up.
Taking a thorough look at someone.

I was taking the new tenant’s measure when she suddenly looked up at me. It was very embarrassing!