1. épeler: This is the most common translation for "spell out" in the sense of reciting the letters of a word.
Example: "Can you spell out your name?" -> "Peux-tu épeler ton nom?"
2. détailler: This translation is used when "spell out" means to explain something in detail.
Example: "Please spell out the instructions for me." -> "S'il te plaît, détaille les instructions pour moi."
3. exprimer clairement: This translates to "spell out" in the sense of making something very clear and explicit.
Example: "He spelled out his intentions." -> "Il a exprimé clairement ses intentions."
4. exposer clairement: Similar to "exprimer clairement", this means to explain something very clearly and in detail.
Example: "He spelled out his plan to the group." -> "Il a exposé clairement son plan au groupe."
Which translation is most appropriate depends on the specific context of your sentence.