paper airplane
n.— «The much-touted Boeing 7E7 Dreamliner is still just a paper airplane, but that’s likely to change soon.» —“Boeing officials report solid base of commitments to launch 7E7 Dreamliner” by Bob Cox Fort Worth Star-Telegram (Texas) July 21, 2004. (source: Double-Tongued Dictionary)
Further reading
On a busy day in the emergency room, Alisa of Dallas, Texas, told an efficient colleague that she was really humming, meaning it as a compliment. Her colleague took offense, maintaining that humming meant “smelly.” Since the 18th...
Twice a day the River Thames recedes, revealing a muddy shoreline. Hobbyists known as mudlarks stroll the surface searching for objects that have found their way into the river over the centuries, everything from ancient Roman jewelry to modern...