twofer

noun

Etymology: Shortened form of two-for-one [deal], that is, two for the price of one (BOGO).

1. Something sold at a discount of two for the price of one.

   “I dashed into the mall; bought a gift; raced to the card store, snapped up a two-fer gift-bag special and was back in my car in 26 minutes. I could medal in power shopping.”

   “Thus, it was interesting to see that when the ISO 55001 Asset Management Standard was released last year, it also looks for an asset-management program to deliver its own twofers and threefers.”

2. Something that yields a substantial additional benefit; something that figuratively kills two birds with one stone.

   “Justice Clarence Thomas served up a twofer last week […]”

3. The fashion of wearing long sleeves outside a short-sleeved shirt.
4. A cabling device used in theatre, allowing two stage lighting instruments to be connected to one dimmer.