Like string on a bobbin

• Prepared to send, as data to a printer
• Wound, as thread
• Wound on a bobbin
• Wound thread
• Sent to a print queue
• Sent to the printer
• Wound, as on a reel

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Spool \Spool\, v. t. [imp. & p. p. Spooled (sp[=oo]ld); p. pr. & vb. n. Spooling .] To wind on a spool or spools.

Wiktionary Word definitions in Wiktionary
vb. (en-past of: spool)