have (one's) head screwed on (right)
To have sound judgment. I'm not surprised that Melissa invests most of her paycheck instead of spending it frivolously because she's always had her head screwed on right.
have one's head screwed on right
see under have a screw loose.
have your head screwed on
INFORMALIf someone has their head screwed on, they are sensible and realistic. Good girl! I always knew you had your head screwed on properly. The only one with her head screwed on was granny.
have your head screwed on (the right way)
have common sense. informalhave your ˈhead screwed on (the right way)
(informal) be sensible: You can certainly trust Ann with your money. She’s got her head screwed on the right way. OPPOSITE: have a screw loose