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To rouse to activity or heightened action, as by spurring or goading; excite. See Synonyms at provoke.
(verb-transitive)
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To increase temporarily the activity of (a body organ or part).
(verb-transitive)
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To excite or invigorate (a person, for example) with a stimulant.
(verb-transitive)
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To act or serve as a stimulant or stimulus.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.