idioms

  vested interest (a strong personal interest in something because you will benefit from it) Mike has a vested interest in your promotion, as he hopes to get your job. Both countries have a vested interest in signing the trade agreements.   envocabulary.com

  Joe Blow  US, informal (an average or ordinary person) The watch was very expensive and not something Joe Blow could afford to buy. The prince wanted to live the life of Joe Blow. envocabulary.com

  Jekyll and Hyde (a person with two personalities, one good and the other evil) She is a real Jekyll and Hyde, sometimes kind and at other times rude. You can’t expect him to be friendly; he’s Jekyll and Hyde. envocabulary.com

  jangle nerves (make you feel annoyed or nervous) The constant whine of this machine jangles my nerves. The noise of the kids in the playground jangled my nerves. envocabulary.com

  jam on the brakes (press down the brakes of a car suddenly and forcefully) The driver jammed on the brakes, and the car skidded and went into a tree. I had to jam on the brakes to avoid hitting the animal. envocabulary.com