noun
a person who takes care of a child in the absence of the child's parents
verb
to care for a child in the absence of the child's parents
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I will need to hire a babysitter to baby sit my children while I attend the conference.
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Can you baby sit my cat for the weekend?
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I'm going to ask my cousin to babysit my little brother tonight.
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As the project manager, it's my responsibility to baby sit the progress of the team's tasks.