Also found in: Idioms.
1. could do with can do with to find useful; benefit from: she could do with a night's sleep.
2. have to do with to be involved in or connected with: his illness has a lot to do with his failing the exam.
3. to do with concerning; related to
4. what…do with
a. to put or place: what did you do with my coat?.
b. to handle or treat: what are we going to do with these hooligans?.
c. to fill one's time usefully: she didn't know what to do with herself when term ended.