expression
from the beginning; from scratch
Used when starting something over completely, without relying on previous work or existing materials.
計画が失敗したので、一からやり直すしかない。
The plan failed, so we have no choice but to start over from scratch.
このケーキは一から手作りした。
I made this cake from scratch.
From 一 (one) + から (from), literally 'from one'. The expression uses the number one to represent the very beginning or the first step.