From Longman Dictionary of Contemporary Englishramble on phrasal verb British EnglishSUBJECTto talk or write for a long time in a way that other people find boring SYN go on about My father kept rambling on about the war. → ramble→ See Verb table
Examples from the Corpus
ramble about• He rambled on about making his home here with Maria Luisa on this wonderful island.• You should indicate the aspects of your background which the interviewer is looking for without rambling on about things which are irrelevant.• On a slow day, Quigley just goes through the newspapers and rambles on about whatever comes into his brain.• But he's been rambling on about you, Miranda. 