Machah (מָחָה) means to wipe or blot out something completely — the way ink is wiped from a tablet or a name removed from a register. It describes total erasure and obliteration. Significantly, it is used both for God blotting out sin (Isaiah 43:25) and for the threat of blotting out a name from the book of life (Exodus 32:32-33).
The theological weight of machah is enormous. Moses intercedes after the golden calf: 'Please forgive their sin — but if not, then blot me out of the book you have written' (Exodus 32:32). God's response establishes the principle: names are blotted out for their own sin, not substituted by another. Yet Isaiah 43:25 offers the gospel: 'I, I am he who blots out (machah) your transgressions for my own sake.' The blotting out of sin, not the sinner, is God's desire. Revelation echoes this: Christ promises that the overcomer's name will not be blotted from the book of life (Revelation 3:5). The cross is where God's machah of sin is accomplished — sins are wiped clean by Christ's blood.
The double use of machah — blotting out sin and blotting out names — creates the central drama of redemption. God wants to blot out sin, not the sinner. The cross accomplishes the ultimate blotting: 'having canceled the record of debt that stood against us... he set this aside, nailing it to the cross' (Colossians 2:14). The 'record of debt' was literally blotted/wiped out. What once condemned us has been erased.