What does the idiomatic expression to slack up mean?

"To slack up" is an idiomatic expression meaning to relax, slow down, or lessen effort. It implies a decrease in intensity or activity.

Here are some examples of how "to slack up" can be used:

* "After working so hard all week, I'm ready to slack up and enjoy the weekend." (meaning relax and take it easy)

* "The team needs to slack up on the joking around and focus on the task at hand." (meaning reduce the amount of fun and prioritize work)

* "The traffic has slacked up a bit now that we're out of the city." (meaning the intensity of the traffic has lessened)

It's important to note that "to slack up" can sometimes have a negative connotation, suggesting laziness or lack of effort.