slack off on (something)(redirected from slacked off on)
slack off on (something)
1. To release or ease the tension or pressure on something, such as a rope or cable. Make sure you don't slack off on those harnesses before we've come to a complete stop.
2. To be or become lazy or unproductive in relation to some task or activity. If you keep slacking off on your financial reports, we'll be forced to give you a formal warning. Just because you're this big shot athlete doesn't mean you can slack off on your studies.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.