tat·tle 
/ˈtætl̟/ verb
tat·les; tat·tled; tat·tling /ˈtætl̟/ verb [no obj] chiefly US, informal : to tell a parent, teacher, etc., about something bad or wrong that another child has done
▪ He saw his sister take a cookie and threatened to tattle (to their mother). — usually + on ▪ He tattled on her. — see also tittle-tattle
▪ He saw his sister take a cookie and threatened to tattle (to their mother). — usually + on ▪ He tattled on her. — see also tittle-tattle
— tat·tler /ˈtætl̟ɚ/ noun, plural tat·tlers [count]
▪ She's a crybaby and a tattler! [=tattletale]
/ˈtætl̟ɚ/ noun, plural tat·tlers [count] ▪ She's a crybaby and a tattler! [=tattletale]
