estoppel by deed

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun law A legal doctrine under which a first party who purports to sell real property that the first party does not actually own to a second party must actually convey that property to the second party if the first party later acquires title to that property.
• noun law, archaic The doctrine that a party is bound to a claim which that party made in order to induce another party to act.