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as a dog returns to his vomit, so a fool repeats his folly

Foolish people are apt to repeat their missteps. A: "I can't believe Sarah is going skiing again, after she broke her leg the last time." B: "Well, as a dog returns to his vomit, so a fool repeats his folly."
See also: dog, folly, fool, repeat, return, to

history repeats itself

Said when something that has happened in the past recurs in the present. Can be used in the negative to mean the opposite. And, once again, I got dumped. History repeats itself. The home team has lost their last three game sevens, so I bet they're hoping that history doesn't repeat itself tonight.
See also: history, itself, repeat

lather, rinse, (and) repeat

An instruction to repeat the same steps of some process, perhaps multiple times, in order to achieve the same desired result. A reference to instructions found on some bottles of shampoo. It's easy, you just cut a piece of the material to length, fold it in half, then sew along the edges. Lather, rinse, and repeat until you've done 50 of them. My last job was so mindless. I would just input customer details into a spreadsheet, export the file to our internal format, then add it to the company database. Lather, rinse, repeat, all day long.
See also: repeat

repeat (oneself)

To repeat what one has previously done or stated. Be sure to take detailed notes, because I will not repeat myself. People surprised at the sudden shift in public opinion would do well to remember that history tends to repeat itself.
See also: repeat

repeat after me

Once I say something, please repeat it. A noun or pronoun can be used between "repeat" and "after," specifying what is to be repeated. A: "Repeat after me: I solemnly swear." B: "I solemnly swear." Please repeat the vows after me.
See also: after, repeat
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

History repeats itself.

Prov. The same kinds of events seem to happen over and over. It seems that history is about to repeat itself for that poor country; it is about to be invaded again. Alan: The country is headed for an economic depression. Jane: How do you know? Alan: History repeats itself. The conditions now are just like the conditions before the last major depression.
See also: history, itself, repeat
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

repeat oneself

Express oneself in the same way or with the same words, as in Grandma forgets she has told us this story before and repeats herself over and over, or This architect tends to repeat himself-all his houses look alike. A well-known version of this idiom is the proverb History repeats itself, first recorded (in English) in 1561. For example, Her mother also married when she was 18-history repeats itself. [Mid-1800s]
See also: repeat
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Exon 1 encodes a protein associated with transcriptional activity and also has CAG trinucleotide polymorphic repeats.4 Long (CAG)n repeats in the AR compromise several androgen - dependent functions, especially erectile function.
To date, neither the courts nor the commission have articulated a uniform test regarding what constitutes a repeat violation.
Of this total group, 72 patients went on to require two or more repeat laparotomies and a total of 182 repeat laparotomies were performed on this patient cohort.
Within such conceptualisations, however, the absence of particular attributes may lead to deficit beliefs about the students or the students' background, which may in turn influence decisions to repeat students at preschool or delay their entry into school until they are 'ready'.
During the two weeks from December 20 to January 2, 729 of the 1154 programmes on the main four channels will be repeats.
This Q-Probes study was designed to determine the proportion of repeated critical results, the proportion of repeated results that still met the criteria for a critical result, the proportion of repeated results that were significantly different from the original result, and the median time between the initial and repeated test result for multiple laboratories that repeat at least some critical values.
Less is known about the women who require repeat abortion services in low-resource settings.
The pathway allows accredited optometrists to repeat diagnostic tests in order to confirm the risk of disease, thus improving the accuracy of referrals and deflecting unnecessary referrals.
The ACR said that while there is plenty of unnecessary testing, not all repeat tests fall into that category.
Are we about to see history repeat itself?" Any football punter with any sense of course knows that history won't repeat itself and won't be backing a 4-4 scoreline at 250-1.
MIAMI BEACH--Compliance with postpartum visits and long-acting reversible contraception significantly reduced repeat pregnancies among 210 first-time adolescent mothers, according to a retrospective chart review.
How to save time and hassle with your repeat prescriptions.
Network of geomagnetic repeat stations consists of 6 repeat stations of the first class, evenly distributed on the Latvian territory.
To deal with this unacceptable frequency of false rejections, a common practice is to repeat the QC examination for any failing analytes and again apply the 1:2s rule (2).
Gen-Probe announced that the FDA has approved its PROGENSA PCA3 (Prostate Cancer gene 3) assay, the first urine-based molecular test to help determine the need for repeat prostate biopsies in men who have had a previous negative biopsy.