with it, be

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be with it

1. slang To be alert and responsive. I'm sorry, I'm just not with it until I've had my coffee in the morning. You've got to be with it, people! We have a deadline here!
2. slang To be hip, fashionable, or in line with current trends. Her latest fashion line just isn't with it—it's not what today's teens want to wear.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

with it, be

Also, get with it. Be or become knowledgeable about the current or latest trends, fashions, or ideas, as in She just turned 60, but she's still very much with it, or Get with it, Dad, that kind of razor hasn't been made for years. [Slang; 1920s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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