Denotes the act or practice of telling tales; functions as an abstract or activity noun, occasionally countable.
Her constant tale-telling eventually alienated her coworkers.
Её постоянное сплетничество в конце концов оттолкнуло коллег.
Used attributively to mean 'revealing' or 'connected with the telling of tales'; relative adjective, no comparative/superlative forms in regular use.
Her tale-telling glance said it all.
Её красноречивый взгляд говорил сам за себя.