Promissory Estoppel Vertrauensprinzip Promissory Estoppel Estoppel por promesa Estoppel por promesa Estoppel par promesse אסטופל על פי הבטחה प्रतिज्ञा निषेध 約束禁止反言 Estoppel promissório 承诺禁止反言 A legal doctrine that prevents a party from going back on a promise made to another party, even if the promise was not supported by consideration, when the other party relied on the promise to their detriment.