别光闲荡了，做点正经事吧！ Don't just maunder about: do some work!
从前他总是在公园里闲荡，无所事事。 Formerly he often lingered about a park, doing nothing.
"你他妈的是谁？" 他粗暴地问道。 "你为何在这儿闲荡？" "And who the devil may you be?" he asked truculently. "What are you doing, hanging about here?"
假若你发现有人在天黑以后在你家屋后闲荡，你就会觉得有理由控告他。 If you found someone loitering at the back of your house after dark, you might feel justified in bringing charges against him.