What does Genesis 7:4 mean?
In the prior verses, God instructed Noah to board the ark along with his family, and all the animals God intends to save. As one would expect, this took quite some time to complete. God reveals His final deadline for the flood to Noah: seven days. In seven days from this moment, the rain would start. It would continue for 40 days and 40 nights, a deluge that would end all life "from the face of the ground."Noah had one week to get everything inside the ark which would be needed during the coming wrath of God. Everything left outside, including the rest of the human race, would be utterly destroyed. According to verse 13, they are able to complete this task in exactly the amount of time they have left.
The word used for "earth" here is from the Hebrew root 'erets. Some Bible scholars interpret this account as a local flood—one covering the territory of men, but not necessarily the entire globe. Terms such as this are part of that discussion. There are other Hebrew terms used to explicitly describe the entire planet, such as tebel, but these are not used in the flood accounts.
Regardless of a local or global interpretation, what's clear is both the intent and the effect of this catastrophe: the complete elimination of the human race, except for Noah and his family.