English: affirm
Spanish: declarar firme (la resolución recurrida o apelada), declarar haber lugar
Definition (English):1. To confirm (a judgment) on appeal. • Sometimes, the verb is used without a direct object <We affirm>. The equivalent expression in British English is to deny the appeal. [Cases: Appeal and Error ~ 1124-1145; Criminal Law ~ll82; Federal Courts 926.] 2. To solemnly declare rather than swear under oath. 3. To testify or declare by affirmation.
Definition (Spanish):(sentencia firme) Adm. Sentencia contra la que no cabe interponer recurso alguno, bien por no preverlo la ley, bien porque, estando previsto, ha transcurrido el plazo legalmente fijado sin que ninguna de las partes lo haya presentado.
Comments:Excellent explanations here: https://www.iberley.es/temas/recurso-apelacion-orden-civil-54181