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To take care of a child or children in the absence of a parent or guardian.
(verb-intransitive)
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To take care of or watch over someone or something needing attention or guidance.
(verb-intransitive)
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To provide care for (a child) in the absence of a parent or guardian.
(verb-transitive)
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To watch over or tend: baby-sat the neighbor's plants for a week.
(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.