It means that you will like it. Something you are interested in.
I think you mean "right up his alley," which means it is something he would really enjoy or really do well.
An idiom that means surrender is to "wave the white flag." A closely related idiom is to "throw in the towel" which means to give up."
If something is right up your alley it is something you enjoy, something your familiar with or something you're good at. For example, if a kid is athletic and enjoys sports, then a field day is right up that kid's alley.
It means things are trustworthy.
Het up means excited or agitated; heated up.
The phrase 'up your alley' means that it is something that you like or might be good at. For instance, a good athlete may find football up his alley.
The idiom "crack someone up" means to make someone laugh or amuse them greatly.
It means shut up!
Picture someone holding their nose up in the air - they look very aloof and snobbish, right? That's what this idiom means.
It means to gather up enough courage to do something.
It means stay with the rest of the group.
It means "shut up" or "be quiet"