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To stick up or jut out: dogs' ears that perk.
(verb-intransitive)
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To carry oneself in a lively and jaunty manner.
(verb-intransitive)
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To cause to stick up quickly: The dog perked its ears at the noise.
(verb-transitive)
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Perky.
(adjective)
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Perk up To regain or cause to regain one's good spirits or liveliness.
(phrasal-verb)
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.