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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 ?
After his family did some online research, they discovered the whale vomit is worth roughly [pounds sterling]40,000, or $63,356.
Treasure hunters shouldn't hope to find similarly valuable whale vomit on Hengistbury Head, the network said.
In addition to the cab vomit fee, the City Council passed other rules and regulations for taxi drivers and their passengers including a permanent $1 passenger fuel surcharge.
Vomit in young children should never contain blood or brown soil-like substances.
Occasionally a vomiting fit can be so violent it tears a blood vessel in the stomach - resulting in some blood in the vomit.
Some people vomit because the exercise shook their stomachs too hard.
That means that she is miserable, and I have to clean up a crate filled with vomit every time we go anywhere - and then again when we go back home," said Leah Cohn, DVM, DACVIM, University of Missouri.
His topic of research was, " Evaluation of some selected medicinal plants and their combinations in Cisplatin induced vomiting in vomit models; behavioural neurochemical correlates".
It can also be spread when someone vomits, shooting small particles of the virus into the air.
One student puts his finger down his throat and vomits, while the other usually gags and then spits up.
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.