Phrasal verbs

    answer back  [phrasal verb] (reply rudely to someone in authority) I wanted to answer back, but I stopped myself and said nothing. Don’t answer back to your father.   (to talk back, defend yourself) It’s so harsh to criticize him without giving him the chance to answer back. …

  account for [phrasal verb] (to form a particular part of something): Teenagers account for the vast majority of our customers. (to explain the cause of something): How do you account for the sudden disappearance of the files? (to be the cause of something): HIV accounted for over 20,000 deaths …

  add on  [phrasal verb] (to add an extra amount or item to something) We will add on our travel expenses. Don’t forget to add on the cost of the meals.   add-on – English Vocabulary

  add in [phrasal verb] (include something with something else) Don’t forget to add in the cost of repairs. It took us two hours to get there, if you add in the time we stopped to rest.   add-in – English Vocabulary

  act up (behave badly): Our children act up from time to time. If you keep acting up like this, I’ll call the police.   (not working properly): This car sometimes acts up in cold weather.   act up – English Vocabulary