slack off

slack off idiom
Decrease in activity or intensity, as in If business ever slacks off we can go on vacation, or When the project fell behind schedule again, she thought we were slacking off. [Second half of 1800s]

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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