know your stuff

know (one's) stuff

To be very knowledgeable or skilled in some area. I think Nicole is our best candidate for the job—she really knows her stuff when it comes to corporate accounting.
See also: know, stuff
Farlex Dictionary of Idioms.

know your ˈstuff

(informal) know everything that you should know about a job, a subject, etc: I was very impressed by your lawyer. He really knows his stuff.
See also: know, stuff
Farlex Partner Idioms Dictionary
See also:
  • know (one's) stuff
  • know one's stuff
  • know stuff
  • know your onions
  • know (one's) onions
  • know about
  • know about (someone or something)
  • have a good command of
  • have a good command of (something)
  • triple threat
References in periodicals archive
You might have questionable taste when it comes to the newspaper columns you read but when it comes to dodgy footballers, you certainly know your stuff.
Football Echo: On the Bounce: Congratulations, you're all utter rubbish!
"To win big money on this show you have to know your stuff," he said.
YARD TO QUIZ TELLY'S NEW pounds 1M WINNER
First, he said, it is important to be prepared educationally, to know your stuff, then work cooperatively to encourage the free flow of ideas.
Foundry commitment to education is strong
If you're an out-of-town-reporter and you want to convince your editors that you really know your stuff, nothing works like a boll weevil in your lead.
The Pope came to South Carolina; unfortunately, so did the Yankee press
It will show prospect investors/lenders that you know your stuff and are capable of pulling this off.
HOW DO I WRITE A BUSINESS PLAN?
Our clients and tenants want to know that you know your stuff; that you've done it before and can do it again; and (again) that you know your stuff.
Magic to do: 3 tips to create marketing magic
nightly business report, believes that if you "know your stuff - know how the media operates and what they want from you" - you're prepared.
Media training: boot camp for communicators
You have to show you know your stuff and have researched the market, potential customers, pricing and your competitors.
WHAT NEXT AFTER BANK REFUSED TO FUND ME? DM1ST mirror.co.uk WEDNESDAY 24.01.2018 DAILY MIRROR 37 BIZBUREAU@mirror.co.uk Biz Bureau, Your Money, Daily Mirror, One Canada Square,BIZBUREAU; London,EXPERT HELP for your business
Biz Replies You need to make sure your business plan is well researched and thorough and shows the bank manager you know your stuff - where you are heading with your venture, your competitors, the figures and the market in general.
FINANCE PLAN MUST BE SPOT ON