fidget in (one's) seat

Translations
ерзать на (своем) месте
The child couldn't stop fidgeting in his seat during the long ceremony.
Ребенок не мог перестать ерзать на своем месте во время долгой церемонии.
Definitions
To move restlessly or nervously in one's seat, often due to anxiety, impatience, or discomfort.
Words
seat

noun
место
fidget

verb
ёрзать