Idioms/Transport

You can say an experience is a roller coaster, or a roller-coaster ride, if it involves many emotional highs and lows, or really good times alternating with really difficult times.

You have burned your bridges, or burned your boats, if you were in a situation and you then left it after doing something that made it impossible to go back there.

You can say "we'll cross that bridge when we come to it" if someone mentions a problem that might occur in the future, but you want them to think about what's happening now instead.

If someone jumps on the bandwagon, they join a movement or follow a fashion that has recently become popular.

If something is plain sailing, it's very easy to do and there are no problems to overcome.

If you put the brakes on something, you stop it or slow it down.

If you rock the boat, you do or say something that will upset people by changing a situation that they don't want changed.

If you steer clear of something, you don't go near it because it could harm you or cause you a problem.

If you upset the applecart, you do something that causes trouble or upsets someone's plans.

A zebra crossing is a pedestrian crossing that is marked on the road with painted black and white stripes.