"brief burst of activity," 1560s, variant of spirt "brief period of time" (1540s), of uncertain origin, perhaps somehow connected with spurt (v.).
"to gush out, squirt," 1560s, variant of spirt, perhaps cognate with Middle High German spürzen "to spit," and sprützen "to squirt" (see sprout (v.)). Related: Spurted; spurting. The noun in this sense is attested from 1775.
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