The full expression is "Let's run it up the flagpole and see if anyone salutes it." In other words, "let's try [an idea] and see how people react." Another variant is "Let's put it in a saucer and see if the cat licks it up." These kind of phrases are primarily associated with glib advertising speak of the early 1960s.
Run It Up the Flagpole was created on 2009-09-01.
Flagpole Sitta - Harvey Danger
It means things are trustworthy.
To make a mistake
About to be sold, or given up.
say no to it
It means shut up!
flatter her to get something
To keep struggling and not give up.
he suddenly turned up (to appear, emarge)
to make something stronger ,,
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.