move out of (someone's) league

Переводы
быть не по плечу (кому-то)
She realized he was moving out of her league.
Она поняла, что он ей не по плечу.
Определения
To become too good, successful, or attractive for someone to be considered a suitable romantic or social match; often used when someone improves themselves and is perceived as no longer being on the same level as another person.