have one's head screwed on

• have one's head screwed on right
• have one's head screwed on straight
• have one's head screwed on the right way

have one's head screwed on (third-person singular simple present has one's head screwed on, present participle having one's head screwed on, simple past and past participle had one's head screwed on)

1. (colloquial) To be a sensible thinker capable of making sound decisions.

• good head on one's shoulders
• have a screw loose