live by wits

live by/on (one's) wits

To survive or make a living through one's intellect and resourcefulness. When I lost everything, I had to live by my wits, and it made me a stronger, more savvy person.
See also: by, live, on, wit
Farlex Dictionary of Idioms.

live by one's wits

Fig. to survive by being clever. When you're in the kind of business I'm in, you have to live by your wits. John was orphaned at the age of ten and grew up living by his wits.
See also: by, live, wit
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • live by one's wits
  • live by your wits
  • live by/on (one's) wits
  • live by/on your wits
  • by (one's) wits
  • by one's wits
  • have one's wits about one, to
  • wit
  • match wits
  • match wits (with one)