DNF
adj.— «The worst finish has been dropped in computing the standing in classes that have completed five or more races): dns–did not start; pms–premature start; dnc–did not compete; dnf did not finish.» —“Winds helpful to U.S. sailor in CORK event” Globe and Mail (Toronto, Can.) Aug. 30, 1978. (source: Double-Tongued Dictionary)
Further reading
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The autocomplete function on your phone comes in handy, of course. But is it changing the way we write and how linguists study language? Also, suppose you could invite any two authors, living or dead, to dinner. Who’s on your guest list and...