"Clam up" means to stop talking, especially when nervous, shy or unhappy. Example: A lot of men clam up when they are having emotional problems.
It means shut up!
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.
The idiom buck up means to cheer up. For example one might say "she began to buck up once I showed her some photographs of her children when they were younger."
If you mean a costume idea, you could dress up as a can - either a tin can or a trash can.
It means you stood up and started giving a speech.
I think you meant 'clam at high tide' or the full version 'happy as a clam at high tide'. This is an idiom/expression dating from the early 19th century. The expression means to be very joyful or content.
It means things are trustworthy.
To make a mistake
About to be sold, or given up.
say no to it
It means to stop talking. A clam has two parts that open when they are steamed.
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 ,,
YES! I think... They can also clam up! -Happily!