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A zebra crossing is a pedestrian crossing that is marked on the road with painted black and white stripes.
A zero-sum game is a situation in which any gain by one side or person is at the expense of a loss to another side or person involved in the situation.
If you zero in on something, you focus your attention on it.
If something is given zero tolerance, it won't be accepted even once.
If someone says "Zip it!", they're telling you to shut up or stop talking about something.