leave somebody to it
leave (someone) to it
To allow someone to do something without one's involvement or interference; to withdraw from someone so they can do or finish something alone. I just had a question about the order, but I can see that you're busy, so I'll just leave you to it. We left him to it after he made it clear that he didn't need our help.
See also: leave
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
leave somebody ˈto it(informal) allow somebody to continue doing something on their own, without your help: Oh well, we’ll leave you to it, Derek — you seem to be managing very well by yourself.
Farlex Partner Idioms Dictionary © Farlex 2017