What idiom can be used to name an action when a person tells a lot of redundant information?
EDIT: To be more precise I am trying to describe an action when a person speaks about the subject but there is also a lot of redundant information.
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Circumlocutions captures that meaning. Where people talk generally in circles or with a lot of fluff. I am also partial to saying that they speak with a low signal to noise ratio, which is to say they say a lot, but the useful amount (signal) is way less than the useless amount (noise).
cir·cum·lo·cu·tion ˌsərkəmˌləˈkyo͞oSH(ə)n/ noun the use of many words where fewer would do, especially in a deliberate attempt to be vague or evasive.
That might be an unnecessarily redundant tautology or battology that is long-winded, periphrastic, pleonastic, prolix, verbose, duplicative, effusive, garrulous and wordy despite having been mentioned before in a supererogatory, superfluous, gratuitously excessive, needlessly repetitious, loquacious and circumlocutory way while reiterating what has already been spoken or written.
"He has a habit of repeating himself more than once."
This isn't an idiom, but I would describe it as unnecessarily verbose.
If you are impatient with someone's long repetitive explanation (and they aren't your boss) you might tell them to:
Some other variations of "summarize" in this related question here.
A few other similar idioms I can think of:
You might say the speech was brought to you by the Department of Redundancy Department.
This type of thing is rarely described with an idiom in the English language, if there is one then it is only known by a tiny percentage of the English-speaking population.
However, the type of scenario and/or person which you are describing is well-known in the English language and ussually described with an adjective, not an idiom. Some adjectives you could use are:
long-winded (less formal)
More specifically, you are looking for a verb for this type of action. Some well-known verbs are:
Rambling (talking for too long)
Waffling (Including loads of unnecesary information)
Would talking around fit your need?
From The Free Dictionary: http://idioms.thefreedictionary.com/talk+around
talk around v. 1. To speak indirectly about something: The politician just talked around the issue and never answered the question.
The phrase " to beat about the bush" or " beat around the bush" may be tried. The latter is an American version but has already overtook the former British version.
It means to prevaricate avoiding the main issue. The idiomatic expression is an old one and evolves from its literal meaning in the exercise of beating the bush for rousing the birds.
The expression may mean the speaker's ignorance or a deliberate attempt to avoid embarrassment or hesitation to face the reality. However, he is no where near the difficult topic. So when we tell someone not to beat around the bush, we mean that we want him to tell us something immediately and quickly rather than in a complicated meandering way with much bogus talking.
With vinyl making a comeback, the expression "sounding like a broken record" would work to describe the repetitive (and redundant) nature of someone’s speech:
sound like a broken record
To say the same thing over and over again; i.e., as a scratch or defect on a phonograph record may cause the needle or stylus to skip back and to stay in the same groove and play the same segment over and over.
“He's always complaining about the way she treats him. He sounds like a broken record!”
(paraphrased from the McGraw-Hill Dictionary of American Idioms and Phrasal Verbs, via The Free Dictionary by Farlex.)
I'm not sure there is such an idiom. The nearest I can think are idiomatic verbs which don't necessarily have the sense you intend: rattle on, browbeat, badger, bluster, huff and puff, overelaborate, overemphasize, homilize, pulpeteer.
I would make an idiom up--except that I might not (read on--) : "Blow the wind windward," "Speak out of turn with himself," "Blow bellows over ashes," or "Stretch meaning thin?"
Requests for idioms are a funny thing. If it's hard to come up with an idiom to suit a circumstance it may be because there is no such idiom, or if there is it's more obscure than most would reckon its meaning.
Honestly, I think the best usage wouldn't be an idiom, but a short meaningful phrase like "speak overly redundantly."