(someone's) goof

Translations
ошибка (кого-либо)
It was his goof that led to the project delay.
Это была его ошибка, которая привела к задержке проекта.
Definitions
A mistake, blunder, or error made by someone; often used informally to refer to an accidental or silly action for which a specific person is responsible.
Words
goof

noun
ошибка