upstroke

UK
/ˈʌpstrəʊk/
US
/ˈʌpstroʊk/

Library

The surprising secrets of hummingbird flight - Kristiina J. Hurme and Alejandro Rico-Guevara
turn their wrists during the upstroke
aerodynamics
взмах вверх
Upstroke — это направленная вверх часть взмаха крыла.