press (someone's) luck

Translations
испытывать (чью-то) удачу
You've already won once; don't press your luck.
Ты уже выиграл однажды, не испытывай свою удачу.
Definitions
To take a risk by continuing to rely on good fortune or success, often after already having been lucky, thereby increasing the chance of something going wrong.
Words
luck

noun
удача
press

verb
нажимать