- (informal, intransitive) To do random unplanned work or spend time idly
- Stop mucking about and get on with your work!
- (informal, intransitive) To attempt to do something with a piece of equipment without understanding how it works.
- Don't muck about with the video machine, or you might break it.
- (informal, intransitive, Britain) To be playful; full of fun and high spirits
- It was only a joke. We were only mucking about.
spend time idly
do something with a piece of equipment when you do not understand how it works