To be or become lazy; to procrastinate or avoid work or one's duty. If you keep slacking off, we'll be forced to give you a formal warning.

What does it mean to slack off?

1 : to do something with less effort or energy than before I was exercising regularly last summer, but I've been slacking off recently. 2 : to become less active, forceful, etc. Their business has been slacking off in recent months.

What does are you on slack mean?

noun. 4. The definition of slack is someone or something weak, slow, relaxed or careless.