"Detallar" is a transitive verb which is often translated as "to tell in detail", and "listar" is a transitive verb which is often translated as "to list". Learn more about the difference between "detallar" and "listar" below.
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A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
1. (to describe in detail)
a. to tell in detail
Cuando el médico detalló lo que me harían en la operación, me desmayé.I fainted when the doctor told me in detail what they would be doing to me in the operation.
b. to detail
Deberías escribir una carta detallando las razones de tu dimisión.You should write a letter detailing the reasons for your resignation.
2. (to specify)
a. to itemize
El contrato detalla las normas que los inquilinos tenemos que seguir.The contract itemizes the rules we tenants have to follow.
b. to itemise (United Kingdom)
En el documento se detallaban los errores que restaban puntos a la nota del examen.The errors which deducted marks from the exam grade were itemised in the document.
3. (to add details to)