paper airplane
n.— «Aviation has a long history of what people call “paper airplanes”—some guy comes along who’s going to build a new plane that goes 1,000 miles an hour and only costs $200 to fly, and he raises money and is never heard from again.» —“Founder of firm creating ‘cheap’ jet to speak at DWC” by Dave Brooks Nashua Telegraph (N.H.) Apr. 6, 2005. (source: Double-Tongued Dictionary)
Further reading
Imagine telling someone how to get to your home, but without using the name of your street, or any other street within ten miles. Could you do it? We take street names for granted, but these words are useful for far more, like applying for a job or...
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...