tat·tle·tale 
/ˈtætl̟ˌteɪl/ noun
plural tat·tle·tales /ˈtætl̟ˌteɪl/ noun [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
▪ No one likes a tattletale. [=(Brit) telltale]
▪ No one likes a tattletale. [=(Brit) telltale]
