idioms

zero tolerance (a way of applying the law very strictly so that people who break it, even in a very small way, are punished severely.) This county has a zero-tolerance policy on drug trafficking. The police announced that there would be zero tolerance for drunk driving.   envocabulary.com

zero-sum game (a game in which you can win only what another person loses) This kind of business is a zero-sum game because someone gains what the other loses. I know with absolute certainty that the project will succeed, and it’s not a zero-sum game.   envocabulary.com

zero hour (the time set for the start of a military attack or an important event) The zero hour for the attack was 1:00 AM local time. It’s almost zero hour for the wedding ceremony. I have to finish the report. I am at zero hour.   envocabulary.com

  since when  spoken (used in questions to show that you are very surprised, angry, or doubtful) Since when do you care what I think? Since when have you been interested in her feelings? envocabulary.com

  count someone out  informal (exclude someone from an activity or plan) I don’t like to stay out late at night, so you can count me out. Alex wants to come with us, and you shouldn’t count him out. envocabulary.com