let get on with

let (one) get on with (something)

To allow or permit one to continue or resume some activity or task. Thanks for explaining all that to me. I'll let you get on with your work now. They'd probably be finished with the project by now if you'd stop interrupting them and just let them get on with it.
See also: get, let, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

let someone get on with something

to permit someone to continue something. I will leave now and let you get on with your work. She had to settle the matter first. She would not let herself get on with life until the matter was settled.
See also: get, let, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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