{adv. phr.}, {informal} With no help from anything done before; from the beginning; from nothing. * /Dick built a radio from scratch./ * /In sewing class, Mary already knew how to sew a little, but Jane had to start from scratch./ Compare: FROM THE GROUND UP.
FROM SCRATCH
Meaning of FROM SCRATCH in English
Dictionary of English idioms . Словарь английских идиом. 2012