"Getting one's hackles up" is a reference to animals that, in an effort to make themselves appear larger and more menacing, they will raise the hair on the back of their neck and down their back to serve as a visual warning to their apponent that the situation is reaching the flash point.
don't get angry or irritated
It means things are trustworthy.
About to be sold, or given up.
To make a mistake
say no to it
I would say they are being aggressive or scared.
To keep struggling and not give up.
It means shut up!
flatter her to get something
he suddenly turned up (to appear, emarge)
The hairs on the neck and back that stand up when a dog is showing aggression are called "hackles."
It's not an idiom. To break camp means to break it up, to pack your things and leave the area. It can be used as slang, however, to mean a group "packing up" and leaving.