Estoppel is a judicial tool allowing a court to prevent, or "estop" a person from making assertions or from going back on the person's word. The person being sanctioned is "estopped."
So, for instance, when person A, by act or words, gives person B reason to believe a certain set of facts, and person B takes action based on that set of facts, person A cannot later, to person A's benefit, deny those facts or say that person A's earlier act was improper.
Estoppel has been defined by the Utah Supreme Court as:
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(For reference: 57-8 is the Condo Act, 57-8a is the Community Association Act, 16-6a is the Nonprofit Act)