A cylindrical device on which film, magnetic tape, thread, or other flexible materials can be wound; a reel
A spool on a fishing reel which may be disengaged from the rest of the reel mechanism, enabling it to spin freely; the setting on the reel which allows the spool to do this; the action of spinning freely in this way.
To put (a fishing reel) on a setting that allows the spool to spin freely; to use or cast (bait) on a line with the reel on this setting. Also without object Compare free spool.
Unwind or cause to unwind from or as if from a spool