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To protect from harm by or as if by watching over: guard a bank; guarding the President. See Synonyms at defend.
(verb-transitive)
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To watch over so as to prevent escape or violence: guarded the prisoner.
(verb-transitive)
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Sports To keep (an opposing player) from scoring or playing efficiently.
(verb-transitive)
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To maintain control over, as to prevent indiscretion: Guard what you say.
(verb-transitive)
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To supervise entry or exit through; keep watch at: guarded the door.
(verb-transitive)
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.