For All One Is Worth Meaning

(idiomatic) Intensely, vigorously, with as much effort as one can supply.

Example:   You should see him out there in the snow, shoveling for all he's worth.
2011 December 29, Keith Jackson, “SPL: Celtic 1 Rangers 0”[1], Daily Record:
  And although they were pushed harder than even Lennon might have expected on a night of galeforce winds, they clung on to the lead Ledley gave them for all they were worth until their rivals had blown themselves out and surrendered top spot.