In the old days before individually wrapped servings of everything, many foodstuffs were shipped in barrels, and sold from the barrel. Pickles, for example; the merchant would open the top of the barrel, and customers would reach into the barrel with tongs and take the pickle they wanted.
Since the customers could easily see the pickles, they would normally pick a good-looking pickle, leaving the less desirable ones behind. So, the pickles at the "bottom of the barrel" were the ones that nobody else wanted. In trying to pick up one of these least-desirable pickles, the customer would "scrape the bottom of the barrel".
So, to "scrape the bottom of the barrel" is to have selected one of the least-liked options.
If you think about this, you can figure it out. If fish are trapped in a barrel, how could they get away from a gun? It means something is ridiculously easy.
jump a lots
To talk fast.
to want to do something; a wanting to entertain oneself
Clockwork isn't an idiom that I'm aware of. The work means something that is mechanical, driven by old-fashioned gears and wheels. It can also mean something that runs as smoothly as if mechanical, or something repetitive and mechanical-seeming.
Over a Barrel: helpless, at a disadvantage
If you think about this, you can figure it out. If fish are trapped in a barrel, how could they get away from a gun? It means something is ridiculously easy.
If you mean like: I am going to scrape gum off the table, then it is scraping. If you mean like: I am going to add photos to my scrap book, then it is scrapping.
You are constipated.
RFP is not an idiom. It's an abbreviation.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
idiom means expression like a page in a book
It's not an idiom. It means the tip of your nostril.
"Sieve" is not an idiom. See the related link.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
Simply its mean a bully.