Liam O'Connor skrev:
> Is it "plum out of luck" or "plumb out of luck"?
If you are talking about a plum that is being squeezed, it's a
plum out of luck. But the ordinary expression is "plumb out of
luck" which means "completely out of luck"
> Why?
Because that is what "plumb" means in this sentence. "Plumb" also
means "weight/lead/sinker/plumb bob" - that is something heavy at
the end of a line. Such a contraption is used to measure if
something is precisely vertical, and this has led to "plumb"
meaning "perfectly" or "completely".
> Googling, I find both.
"Plum" is an error - a (in this group) socalled eggcorn.
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