Dismiss means prevent something or someone from continuing, and is a term commonly used in the field of law.
In the legal field, when it comes to "dismiss the appeal" means that the filed process has been refused and is considered void.
When a person needs to solve a legal problem because he considers himself wronged by something or something, he hires a lawyer to represent him through a lawsuit.
An appeal is an appeal used to appeal the decision of a lower court judge, when the appellant does not fully or partially agree with that judge's decision.
So, the process goes up to the 2nd instance, Civil Court, Criminal or Court of Justice, in this case, the 2nd instance judge gives the name of Judge, and the process is judged by 3 judges, being a rapporteur, another reviewer and the one who votes together with one of the two.
The judge who heard the appeal may grant or deny the request. If the appeal is denied, being considered inadmissible, unfounded, this will mean that the appeal was not accepted, it was not accepted and the final decision will be the first one instance.
See also the meaning of granted with appeal and the meaning of rejected.