He knows better than to touch the wet paint.

Before the meeting, she compiled a list of need-to-knows for the new team members.

She may have a degree, but she still doesn't know shit from Shinola when it comes to managing money.

After the announcement, I did not know what hit one.

She seems to not know which end is up when she's asked to make basic decisions.

After twenty years in the kitchen, Chef Morales seems to know every trick in the book when it comes to making sauces.

He wouldn't know someone from Adam if he bumped into him on the street.

When she called me stubborn during our argument, I shot back, 'it takes one to know one'.

Excuse me, do I know you from somewhere?

Before we decide to go through with the plan, you know what they say: better safe than sorry.