Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
make a mountain out of a molehill: make something that is unimportant seem important
Example:
Every time the baby gets the sniffles, Karen rushes off to the doctor with him. She needs to relax, rather than keep making a mountain out of a molehill.
monkey business: unethical or bad activity, mischief
Example:
I understand why Hank is so willing to ignore all the monkey business his nephew is involved in, but doesn’t he realize it will ruin his business?