get the OK
To receive permission or approval to do something. Don't worry, I got the OK from the boss before I started doing all this research.
give (one) the OK
To tell one that it is permissible to do something. Don't worry, the boss gave me the OK to work overtime this week.
give somebody/get the OˈK/oˈkay
(informal) give somebody/receive approval or permission: I’m waiting to get the OK before I start on the project.He can’t start until his boss gives him the OK.