have one's head screwed on right

have (one's) head screwed on (right)

To have sound judgment. Primarily heard in UK, Australia. 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.
See also: have, head, on, screw

have a screw loose

To be or seem particularly silly, eccentric, crazy, or mentally unstable. (Also worded as "have a loose screw.") That guy on the corner must have a screw loose or something, because he's been standing out there yelling obscenities at passersby all morning. My old uncle Pete has a few screws loose, but he's a really nice guy.
See also: have, loose, screw

have one's head screwed on right

see under have a screw loose.
See also: have, head, on, right, screw
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