could do with (something)
One would benefit from something (which is usually stated after "with"). In this heat, I could do with a cold glass of water right now. You could do with some new shoes—those ones are looking awfully beat-up.
could do with someone or something
to want or need someone or something; to benefit from someone or something. I could do with a nice cool drink right now. I could do with some help on this project.
can do with
Also, could do with. Might profit from, needs, as in This room can do with a good cleaning, or Harry could do with a new suit. [Colloquial; late 1700s] Also see do with.
could ˈdo with something
(spoken) want or need something: I could really do with a coffee.Her hair could have done with a wash.You look as if you could do with a good night’s sleep.