Secondary work or side project that is done in addition to one's main job or responsibilities.

मुख्य कार्य के अतिरिक्त किया गया कार्य

English Usage: Many freelancers often take on bywork to supplement their income.

Hindi Usage: कई फ्रीलांसर अपनी आय बढ़ाने के लिए बायवर्क लेते हैं।