means To work or move with energetic, often frantic urgency — or, in its shadier sense, to swindle someone through pushy persuasion.

from From Dutch 'husselen,' meaning to shake or toss about — the same restless motion you'd use shaking dice in a cup. English borrowed it in the 17th century with that literal sense of jostling and shoving, and over time the physical pushing softened into hustling for opportunity, money, or marks. The 'energetic striver' and the 'con artist' both descend from the same shake.