know what's good for you

if (one) knows what's good for (one)

If one wants to avoid trouble (one will do or avoid a certain thing). Oh, you'll be on time for the meeting, if you know what's good for you. If he knows what's good for him, he'll stop calling me that.
See also: good, if, know

know what’s ˈgood for you

know what is necessary for you to do to be successful, etc.; know how to avoid trouble: If you know what’s good for you, young man, you’ll talk to nobody about what you’ve seen here tonight.
See also: good, know
References in classic literature ?
You'll sit right there, if you know what's good for you.
Look here, Paul, you'll keep out of this if you know what's good for you.
Try not to to start an argument today, if you know what's good for you.
Try not to start an argument today, if you know what's good for you.
Our response has been an unvarying 'Don't give in if you know what's good for you.
If you know what's good for you, you will make yourself free for him even if you have a pressing appointment.
stay away from that moon door if you know what's good for you.
Now you know what's good for you, it's also essential you don't let bad habits get in the way.
YOU KNOW WHAT'S GOOD FOR YOU, YOUIL VOTE FOR THE SWEET AND SOVR SPAM CHILL .
DON'T mess with the dame if you know what's good for you.
I'm not writing here to force a new version Christ on you O reader but if you know what's good for you you will take the first chance at knowing Him that you can get.
London, Dec 27 (ANI): When Oprah Winfrey and Kate Moss espouse "detox" regimes or, when Sharon and Kelly Osbourne say that the Pill can cause cancer, don't take them too seriously if you know what's good for you, say scientists and doctors.
Things are distorted with the booze haze and you don't know what's good for you.
You'd better stop giggling if you know what's good for you, Bruno Alves.
He might make you do it twice, but if you're working for a Morico photo, you're going to do it again if you know what's good for you.