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A principle that prevents someone from making actions, statements or promises that are the opposite of what that person has earlier said, promised or otherwise implied (=suggested without saying it directly) or done, or that go against a finding of a court of law, especially when this would result in loss or harm to another person. Also known as equitable estoppel or estoppel in pais.

For example, if a Jack leads Sam to believe that the fee for a balloon ride is $50, yet after the balloon sets down he tries to charge the Sam $75, Sam has an estoppel defense … if he can prove that Jack unreasonably changed position.

Note: To establish estoppel, the plaintiff must show that she was, in some manner, misled by the acts or statements of the defendant.