To "tell on someone" means to report their misdeed to the appropriate authorities. It is generally heard among children, for whom the authorities are likely to be parents or teachers. Adults may use it light-heartedly, but in the case of serious infractions are more likely to say "I will report this" or "I plan to file charges" than "I'm telling on you."
It means to tell someone in authority about what the person has done that they were not supposed to do.
An idiom is a saying or expression. There are many idioms that mean to stay away from, or avoid, someone. An example of such an idiom would be, "to steer clear of" someone.
save someone's life
To openly discuss a disagreement with someone.
This is supposed to mean that someone is talking about you.
The idiom "crack someone up" means to make someone laugh or amuse them greatly.
It means someone with spunk.
The image is of a heavy weight on your heart (which is inside your chest) - you are getting rid of that weight by telling someone why you are unhappy. This idiom means to share your feelings and thus "clear the air" of suppressed emotion.
This is not an idiom. It means exactly what it says -- someone is putting their hands into their pockets.
It's not an idiom. "Cool" is a slang term meaning someone is popular or fashionable.
It's not an idiom because you can figure it out. It's a childish rhyme meaning someone who is not pretty.
It's not an idiom. "Cool" is a slang term meaning someone is popular or fashionable.
Keep bothering someone.