flap of a bird's wing

Translations
взмах крыла птицы
She watched the graceful flap of the bird's wing as it took off.
Она наблюдала за изящным взмахом крыла птицы, когда она взлетала.
Definitions
The movement or action of a bird's wing as it is raised and lowered during flight, which is essential for generating lift and propulsion.
Words
flap

noun
клапан
wing

noun
крыло