To lie around (or lie about) is to spend time lying down in the same place, doing nothing or very little. (Informal English)
Examples of use:
1. You’ve been lying around all day. Why don’t you get up and do something?
2. Henry is getting fed up with his brother. He just lies around at home all day and he won’t get a job.
We also use lying around (continuous) to talk about something that is not being used, or is not needed, and probably needs tidying up.
Example of use:
You need to tidy your room – you have clothes lying around all over your floor.
infinitive – lie around
present simple – lie around and lies around
-ing form – lying around
past simple – lay around
past participle – lain around
See also, stand around and sit around
Image by Cynthia Perry