Catch As Catch Can Meaning

(idiomatic) To use any available means or methods.

Example: a. 1681, John Fryer, Richard Chiswell, Robert Roberts, Robert White, A New Account of East-India and Persia, in Eight Letters, Being Nine Years Travels, Begun 1672 and Finished 1681
  Which being done, the Women run in the dark to catch as catch can ; and whatever Lot they light on,