/prɑˈmɪsəri ɛˈstɑpəl/ – Phrase
Definition: Nguyên tắc pháp lý mà theo đó một hợp đồng hoặc cam kết có thể được thực thi mặc dù không có sự cân nhắc pháp lý truyền thống.
A more thorough explanation: the common law principle that a person cannot withdraw a promise made to someone if that person has reasonably relied on it and acted on it to their cost
Example: By giving up his position at Virginia Tech, Salaita gave up a job in which he had academic freedom; thus, recognition of his promissory estoppel claim should mean that Illinois must afford him academic freedom.