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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

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 ?
Flows which vary quickly or which pulsate require fast measurements for good accuracy and repeatability. To achieve a fast measurement with a pressure transmitter--both the DP transmitter used with an orifice meter and the static pressure transmitter used for the linear and orifice meter--the user should:
Scheimpflug-Placido topographer and optical low-coherence reflectometry biometer: Repeatability and agreement.
In our study, the repeatability and reproducibility ([zeta]w) of IOP were very good, approximately 1 mmHg (0.98 and 1.12, resp.).
The best experiment is therefore defined as the one characterized by the smallest CV% recorded over the design experiments minus 20% (best repeatability) and the worst as the one characterized by the largest CV% plus 20% (worst repeatability).
High repeatability of maximum numbers of antral follicles = 3mm in diameter in different follicular waves of same estrous cycle and different estrous cycle was observed in Nili-Ravi buffalo heifers in the present study.
Traits with important signalling functions in mate choice are expected to show higher repeatability than less-critical traits.
Our most recent research, therefore, focused on methods by which deposit-to-deposit repeatability and proper paste volume could be realized.
A small-capacity unit, the Air Servo is said to provide excellent waveform repeatability, while its pneumatic operation is said to ensure a minimal effect on the surrounding environment.
Requirements for the automatic handling included process reliability, repeatability, short cycle times and high flexibility in order to produce as large a range of parts as possible in a limited space.
Repeatability is [+ or -] 1 percent of actual flow and [+ or -] 0.25 percent of actual temperature.
Featuring increased stability and precision, the system assures high accuracy, repeatability and smooth cut edges.
Test quality for all the basic pulmonary function tests (spirometry, diffusing capacity for carbon monoxide and lung volumes) involves getting a number of acceptable trials and meeting repeatability criteria.
-- Repeatability is one characteristic of a robot, which is of tremendous importance.