idioms

  high gear  informal (a state of maximum or efficient activity) I studied hard before the examination, and my mind is in high gear. The project is starting to move into high gear.   envocabulary.com

  under lock and key (securely locked up; well protected) She keeps all her valuables under lock and key. I have three kids. That’s why I keep medicines under lock and key.   (in prison; in a place with no chance of escape) All the criminals are now securely under lock …

  it takes one to know one (you are just the same kind of person) A: You are a complete idiot! B: So are you. It takes one to know one. You are such a dork. – Well, it takes one to know one.   envocabulary.com

  keep your shirt on (stay calm) All right, keep your shirt on. I’ll come to the party. Keep your shirt on! I didn’t mean to offend you.   envocabulary.com

  ignorance is bliss (if you do not know about something, you do not worry about it) I’m not an expert on this kind of problem, and ignorance is bliss. He believes ignorance is bliss and didn’t tell his wife about the problem.   envocabulary.com