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Hello, I don't understand very well the meaning of this sentence. Could someone help me with it?
' - had a BIG RUN with J.P.Morgan, a deity figure who owned most of the United States at the time. Roosevelt BACKED him DOWN and threatened to throw him i jail'

Thanks in advance, jo.
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Hello Jo

It's difficult to say without more context; but it seems to mean:

"MrX had a big disagreement with J.P. Morgan, an extremely prominent person and very wealthy businessman. Roosevelt confronted MrX, compelled him to concede to Morgan, and threatened to imprison him."

MrP
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Wouldn't that be "run-in"?
CJ
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Comments  
CalifJimWouldn't that be "run-in"?
CJ

Yes, that's true...

Better discount my version, Anon!

MrP
Students: We have free audio pronunciation exercises.
No, what I meant was that the original was supposed to be "run-in", so your paraphrase sounds fine to me, Mr. P.