It takes almost three minutes for this plot to unspool itself, or six times the length of a standard campaign TV spot.
early 14c., from Old North French spole, espole "a spool" (13c.), from Middle Dutch spoele "a spool," from Proto-Germanic *spolon (cf. Norwegian and Swedish spole, Old High German spuola, German Spule), from PIE root *spel- "to cleave, split" (see spoil).
c.1600, from spool (n.). Related: Spooled; spooling.