explain the reason

Translations
объяснить причину
He couldn't explain the reason for his absence.
Он не мог объяснить причину своего отсутствия.
Definitions
To clarify or provide justification for a particular action, decision, or situation, often by detailing the underlying causes or motivations.
Words
explain

verb
объяснять
the

article or possessive pronoun
этот
reason

noun
причина