start from scratch

Translations
начать с нуля
After losing all the data, they had to start the project from scratch.
После потери всех данных им пришлось начать проект с нуля.
Definitions
To begin something from the very beginning, without using anything that already exists or any previous work as a foundation.
Words
start

verb
начать
from

preposition
с
scratch

noun
нуля