Keep one’s wits about one

What is Keep one’s wits about one?

Keep one’s wits about one definition and meaning on Dictionary terms:
the keen perception and cleverly apt expression of those connections between ideas that awaken amusement and pleasure.
speech or writing showing such perception and expression.
a person having or noted for such perception and expression.
understanding, intelligence, or sagacity; astuteness.
Usually wits. powers of intelligent observation, keen perception, ingenious contrivance, or the like; mental acuity, composure, and resourcefulness: using one’s wits to get ahead. mental faculties; senses: to lose one’s wits; frightened out of one’s wits.