What does this phrase mean: out and out?

[Dinh Huong]

Test No. errors/elem-7 "English Prepositions", question 9

He's an on and on supporter of that political party and nothing you can say will make him change his mind.

(a) on and on
(b) of
(c) make

Test No. errors/elem-7 "English Prepositions", answer 9

He's an out and out supporter of that political party and nothing you can say will make him change his mind.

Correct entry: out and out
The error was: (a) on and on

You have not found the error.
He's an on and on supporter for that political party and nothing you can say will make him change his mind.
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Is "out and out" equal to "faithful"? Thank you very much.

[Alan]

Hi Dinh Huong,

Faithful has the sense of loyal and very supportive but out and out goes further than that. It means extreme almost fanatical.

Alan
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