d.n.f
adj.— «[boat-racing scores:] D.G. Millar, d.n.f.» —“Race Week Starts at Larchmont Y.C.” by James Robbins New York Times July 29, 1943. (source: Double-Tongued Dictionary)
Further reading
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...