grandstand to impress

Translations
показушничать, чтобы произвести впечатление
He often grandstands to impress his colleagues.
Он часто показушничает, чтобы произвести впечатление на своих коллег.
Definitions
To perform or behave in a way that is intended to attract attention or admiration from others, often in a showy or ostentatious manner.