double-dip

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To draw income or funds from two different sources, as from a job and a pension, often in violation of the law.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun informal An ice cream cone with two scoops of ice cream.
• noun A hill that levels off for a while about halfway down.
• verb informal To dip a piece of food (e.g. a chip) into a communal sauce container after already having taken a bite of the food.
• verb informal To be illegitimately compensated a second time for the same activity.
• verb informal To draw a government pension or benefit for one job while also working in the government at another job or to draw two pensions at the same time as a result of reaching the retirement criteria twice for the same entity.
• verb entertainment industry To re-release a movie or TV series, sometimes as a compilation or with additional features.
• verb US, finance To use a single debt instrument to obtain interest tax expense (and therefore a lower tax base) in two or more tax jurisdictions. As long as the practice follows the tax law of each jurisdiction, the practice is legal and can be likened to the use of a tax loophole.
• verb softball To defeat a team twice in the finals.