A subordination agreement is a legal document used to make the claim of one party junior to (or inferior to) a claim in favor of another. It is generally used to grant first lien status to a lienholder who would otherwise be secondary to another party, with the approval of the party that would otherwise have first lien.
A subordination agreement is a document that establishes the relative priority of claims between parties, typically used to give first-rate status to a lienholder who would otherwise be relegated to second place.