Is there a word for mangled idiom that becomes commonplace

Like "does the Pope shit in the woods?" or "that train has sailed?"

Also, what good examples can you think of?

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Get two birds stoned at once
- I like, "get two birds stoned with one bush" as some bastard amalgamation of "kill two birds with one stone" and "a bird in the hand is worth two in the bush"
  
  Two stones with one bird
- I use this one regularly

74 comments