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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

vomit something out

Fig. [for something] to spill forth a great deal of something. The volcano vomited the lava out for days. It vomited out hot lava for months.
See also: out, vomit

vomit something up

to bring up something from the stomach by vomiting. The dog vomited the chocolate cake up. Fido vomited up the rabbit.
See also: up, vomit

vomit forth

1. To be discharged forcefully and abundantly; spew or gush: The dam burst, and the floodwaters vomited forth.
2. To eject or discharge something in a gush; spew something out: The volcano vomited forth lava and ash. The belly of the ship opened and vomited the cargo forth.
See also: forth, vomit

vomit up

To eject some contents of the stomach through the mouth: I vomited up my dinner. The bird vomited the worm up for its young.
See also: up, vomit
References in periodicals archive ?
Akhtar was invited as the chief guest at a school function, where he started enquiring from the children whether they feel nauseating or vomit in school buses.
One student puts his finger down his throat and vomits, while the other usually gags and then spits up.
The grasshopper species Schistocerca emarginata eats foul-smelling skunk bush, then vomits to prevent being swallowed by predators like the green anole lizard.
Every single time my dog Reba rides in the car she vomits.
It can also be spread when someone vomits and aerosols containing the virus enter the air.
Efficacy was evaluated by comparing the number of vomits and the severity of nausea.