have all (one's) marbles

have all (one's) marbles

To be mentally sound or stable. Now that I've gotten a good night's sleep, I'm starting to feel like I have all my marbles again. Grandma still has all her marbles, in spite of her other health problems.
See also: all, have, marble
Farlex Dictionary of Idioms.

have all one's marbles

Fig. to have all one's mental faculties; to be mentally sound. (Very often with a negative or said to convey doubt.) I don't think he has all his marbles. Do you think Bob has all his marbles?
See also: all, have, marble
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

have all one’s marbles

tv. to have all one’s mental faculties; to be mentally sound. (see also lose (all) one’s marbles. Have got can replace have.) I don’t think he has all his marbles.
See also: all, have, marble
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • have all marbles
  • have all one’s marbles
  • have got all (one's) marbles
  • evening of life
  • have a few loose marbles
  • be missing some of (one's) marbles
  • enshrine
  • enshrine (someone or something) in (one's) heart
  • enshrine in heart
  • lose (one's) marbles