Definition of rattle on/away in English:
Talk rapidly and at length, especially in an inane way: she found herself rattling on about unhappiness and happiness
prattle, babble, chatter, gabble, prate, go on, run on, jabber, jibber-jabber, gibber, blether, blather, blither, ramble, maunder, drivel, twitter
Scottish & Irish informalslabber
North American informalrun off at the mouth
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