They backed out of the deal the day before they were due to sign the contract.
They backed out of the deal before the day they were due to sign the contract.
What is the difference in meaning between these sentences?
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Sign up to join this community"The day before" means exactly one day before. If they were due to sign the contract on Friday, this means they backed out on Thursday.
"Before the day" could be any time before the specified day. They might have backed out Tuesday or Wednesday or weeks before the schedule day.