Sag off Definition 1 of 2Pro Tip 1/3Reducing Effort Used to describe gradually doing less work or effort. I noticed you're starting to sag off on your revisions. Pro Tip 2/3Negative Implication Has a negative connotation, suggesting laziness or lack of commitment. Don't sag off now; we're nearly finished with the project! Pro Tip 3/3Colloquial Warning Avoid in formal writing or speeches; it's conversational and informal. She would never sag off in the office, but at home, it's a different story.