tattletale

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tattletale /ˈtætl̟ˌteɪl/ noun
plural tattletales
tattletale
/ˈtætl̟ˌteɪl/
noun
plural tattletales
Learner's definition of TATTLETALE
[count] chiefly US, informal + disapproving
: a child who tells a parent, teacher, etc., about something bad or wrong that another child has done : a child who tattles on another child