rattling adjective 2noun 1forms 3phrases 2 adjective2 •(old-fashioned) good, fine.To say the truth, Sophia, when very young, discerned that Tom, though an idle, thoughtless, rattling rascal, was nobody's enemy but his own […] — 1749 •Lively, quick (speech, pace). noun1 •rattle (a sound made by objects shaking or vibrating against one another) formsrattlings · more rattling · most rattling Phrases with rattling sabre-rattlingA flamboyant display of military power as an implied threat that it might be used. saber-rattlingA flamboyant display of military power as an implied threat that it might be used.