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flap: vt. 1. To unload a DECtape (so it goes flap, flap,
   flap...).  Old-time hackers at MIT tell of the days when the
   disk was device 0 and microtapes were 1, 2,... and
   attempting to flap device 0 would instead start a motor banging
   inside a cabinet near the disk.  2. By extension, to unload any
   magnetic tape.  See also macrotape.  Modern cartridge tapes no
   longer actually flap, but the usage has remained.  (The term could
   well be re-applied to DEC's TK50 cartridge tape drive, a
   spectacularly misengineered contraption which makes a loud flapping
   sound, almost like an old reel-type lawnmower, in one of its many
   tape-eating failure modes.)