1. To use rough tactitcs; to assault suddenly, especially by stealth with superior force; to commit an armed assualt upon an unarmed victim. 2. To take flight from the scene of a crime, deserting one's accomplices. 3. To rob by means of the heel technique. 4. To leave one's hotel or boarding house without paying one's bill. 5. To run away; to flee; to escape; to take to one's heels.

- american underworld dictionary - 1950