have all one's buttons

Idioms and Phrases

Also, have all one's marbles . Be completely sane and rational. For example, Grandma may be in a wheelchair, but she still has all her buttons , or I'm not sure he has all his marbles . These slangy expressions date from the mid-1800s, as do the antonyms lose or be missing some of one's buttons or marbles , meaning “become (or be) mentally deficient.”