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To set upon with violent force.
(verb-transitive)
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To criticize strongly or in a hostile manner.
(verb-transitive)
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To start work on with purpose and vigor: attack a problem.
(verb-transitive)
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To begin to affect harmfully: a disease that attacks the central nervous system.
(verb-transitive)
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To make an attack; launch an assault: The enemy attacked during the night.
(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.