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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

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

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
References in periodicals archive ?
99) for the repeatability of corneal pachymetric measurements using the Galilei Scheimpflug system in normal corneas.
By the method of principal component analysis, the repeatability coefficient based on the correlation matrix and the matrix of phenotypic variances and covariances was estimated.
Repeatability was lower in this experiment but it might be due to size of follicles (2- 6mm).
All of the repeatability estimates for the advertisement call characteristics were high (Table II), but estimates for spectral properties (frequencies of the components) were slightly lower (Mann-Whitney test: U=0.
Menezes, "Calculating and Optimizing Repeatability of Natural Gas Flow Measurements", Pipeline & Gas Journal, July 2001.
Some practitioners of HALT try to apply the golden rule of test repeatability to failures found from combinational stress such as temperature and vibration stress levels.
In order to get to the component of the data that reflects the repeatability of the robot, regression techniques with a linear model were used to remove the variation due to changes in factor levels.
By positioning the bean probe as described above, you will always be measuring the beans in the same manner, thus ensuring repeatability both between roasts and between batch sizes.
Repeatability and reproducibility standard deviations are defined for a fixed value of the measurand.
To summarize, it is often thought that the reality of psi can be substantiated only on the basis of repeatability of psi effects.
Recognized for its superior performance, the ACE platform replaces time-consuming field tests that lack repeatability in multipath environments.
The Roboshot S-2000i55B Series improves the production process through reduced energy, scrap elimination and improved production capabilities, which result in overall cost savings, the company says, adding, "with [its] unmatched repeatability and process control, the Roboshot is especially well-suited for medical product manufacturing and other sophisticated applications requiring clean production, repeatability, ease of validation and tight tolerances.
Capable of producing dispersions down to 1 urn, with [+ or -]1% repeatability, depending on the ingredients and application, the mixer is FDA, USDA and 3A compliant.
0 kg, the model 40366 delivers repeatability of less than 0.
To ensure the best possible repeatability from any process related equipment, scales, mixer, mills, etc.