If someone is “behind bars” it means that they are in jail (prison).  If you watch a lot of American TV or movies you will hear this expression a lot.  It’s one of those phrases you probably didn’t learn in class, but if you can use it, you’ll be one step closer to speaking English like a native speaker.

Here are a couple examples:

His dad is still behind bars.  They haven’t seen each other in over 3 years.

This country is pretty strict.  If you get caught selling drugs here they’ll put you behind bars for a few years.

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