Definitions: (1) working rapidly or energetically; (2) aggressive <especially in business>; (3) to urge, prod, or speed up

• The struggle you’re in today is developing the strength you need for tomorrow. Don’t give up. — Robert Tew (1961-) Australian rugby player & coach
• People with hustle also tend to be much more agile—they’re the water that goes around the rock. These are the people you want around when everything goes wrong. They’re also the people you want beside you when everything goes right. — Leah Busque (1979-) American entrepreneur