It means your intuition (gut feeling) is telling you that something is wrong or is not quite what it seems to be.
Example: "I just saw the man bumming a cigarette, so when he approached me trying to sell me a plan to make money, all sorts of alarm bells started going off in my mind. If he couldn't buy a pack of cigarettes, then how could he help me make money?"
The idiom is " all the bells and whistles ". It means, all the extras possible. For example, the new car came with all the bells and whistles. It was loaded with every option possible.
It means to do something wholeheartedly. It's when you're excited about doing something. You say "I'll be there with bells on" when you're looking forward to it.
Your fire or burglar alarm has gone off.
It means to start a journey or to leave.
Anything you can add to improve it has been done. The idiom " all the bells and whistles " means, all the extras possible. For example, the new car came with all the bells and whistles. It was loaded with every option possible, and a lot of flashy unnecessary gadgets as well.
The idiom "they froze in their tracks" means that they stopped what they were doing. Example- The robbers froze in their tracks when they heard the alarm.
The idiom "putting a spoke in the wheel" means to hinder or disrupt a plan or progress by creating obstacles or problems. It is used to describe actions that derail or obstruct someone's efforts or goals.
It is not an idiom, it means your nose is itching.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
If you "pick up" a hobby, you start doing whatever it is, such as crochet or painting.
"Sieve" is not an idiom. See the related link.