ba·by·sit·ter also ba·by-sit·ter (bā′bē-sĭt′ər) n. 1. A person engaged to care for one or more children in the temporary absence of parents or guardians. 2. A person who cares for or watches over someone or something that needs attention or guidance. ThesaurusAntonymsRelated WordsSynonymsLegend: Switch to new thesaurus Noun 1. babysitter ...