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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."
1. To eject, erupt, or discharge in a great, spewing rush. Water vomited forth from the spot where the iceberg had struck the hull of the ship. The crowd grew angrier and angrier as the speaker's hateful rhetoric continued vomiting forth.
2. To eject, erupt, or discharge something out in a great, spewing rush. In this usage, a noun or pronoun can be used between "vomit" and "forth." As the ground rumbled ominously, it vomited forth a huge jet of pitch-black crude oil into the air. When I get nervous, I can't help but vomit forth any thought going through my head. I had to pull on the blockage with my hands before the pipe finally vomited it forth.
To eject something from one's stomach by vomiting. A noun or pronoun can be used between "vomit" and "up." Thankfully the dog vomited up most of the chocolate, so it didn't make him too ill. I nearly vomited my dinner up riding on that roller coaster!
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.
vomit something up
to bring up something from the stomach by vomiting. The dog vomited the chocolate cake up. Fido vomited up the rabbit.
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.
To eject some contents of the stomach through the mouth: I vomited up my dinner. The bird vomited the worm up for its young.