1. [mid-17C; mid-19C+] (orig. US, also dust along, ...it on, ...off, ...out) to rush off, to leave fast.
2. [late 19C+] (US) to overtake, to pass on the road.
3. [1930s+] (US, also dust off) to get rid of, to jilt.
4. [1950s] to pursue.
[1930s–50s] (US black) to leave.
[mid-19C–1910s] (US) to act energetically; to run off quickly.