verb (used without object)
to gush or issue suddenly in a stream or jet, as a liquid; spout.
to show marked, usually increased, activity or energy for a short period: The runners spurted forward in the last lap of the race.
verb (used with object)
to expel or force out suddenly in a stream or jet, as a liquid; spout.
a sudden, forceful gush or jet.
a marked increase of effort for a short period or distance, as in running, rowing, etc.
a sudden burst or outburst, as of activity, energy, or feeling.
Also, spirt.

1560–70; variant of spirt; origin uncertain

spurter, noun
spurtive, adjective
spurtively, adverb
outspurt, verb (used with object)

1. well, spring. See flow. 4. spout.

1. drip, ooze.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spurt or spirt (spɜːt)
1.  to gush or cause to gush forth in a sudden stream or jet
2.  to make a sudden effort
3.  a sudden forceful stream or jet
4.  a short burst of activity, speed, or energy
[C16: perhaps related to Middle High German sprützen to squirt]
spirt or spirt
[C16: perhaps related to Middle High German sprützen to squirt]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"to gush out, squirt," 1570, variant of spirt, perhaps cognate with M.H.G. spürzen "to spit," and sprützen "to squirt" (see sprout). The noun in this sense is attested from 1775.

"brief burst of activity," 1566, variant of spirt "brief period of time" (1550), of uncertain origin, perhaps somehow connected with spurt (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Biggest growth spurt yet for powerhouse video service.
For example, it is normal for boys to have a growth spurt in weight and catch
  up in height later.
When sedatives injected into the dinosaur kick in, the razor jaws close down on
  the tongue and sever it in a spurt of dark blood.
The company's growth spurt has spawned a host of daunting questions that no
  data-retrieval system can easily answer.
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