let (one) know

let (one) know

To tell or inform one (of or about something). Be sure to let me know if anything changes between now and then. I let the boss know about the development yesterday.
See also: know, let
Farlex Dictionary of Idioms.

let someone know (about something)

to tell someone something; to inform someone of something. Please let me know about it soon. Will you be coming to the picnic? Please let me know.
See also: know, let
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

let somebody ˈknow

tell somebody about something: I don’t know if I can come, but I’ll let you know soon. Let me know how I can help.
See also: know, let, somebody
Farlex Partner Idioms Dictionary
See also:
  • by any chance
  • as we know it
  • I know
  • before you know where you are
  • AFAIK
  • a closed book
  • closed book, a
  • before you know it
  • know what
  • can't say as I do