Estoppel - sustany/dvg GitHub Wiki

Estoppel is an equitable doctrine, a bar that prevents one from asserting a claim or right that contradicts what one has said or done before, or what has been legally established as true.�Estoppel may be used as a bar to the re-litigation of issues or as an affirmative defense.

For estoppel in contract law, promissory estoppel is often applied where there is a promise or an agreement made without consideration.