slack off
中級 (B1) informal
To stop trying as hard as you should — to be lazy about your work or duties.
"You've really been slacking off this semester — your grades are dropping."
文脈の中で聞く
The Intelligence Test Where Ants Beat Humans
Be Smart · 2:32
We tend to slack off a bit.
NVIDIA's New AI Broke My Brain
Two Minute Papers · 0:44
Hey, don’t slack off, that’s my job!