Meaning of through and through

[Guest]

Test No. express/elem-8 "Prepositions", question 9

It's quite clear to everyone that she's a socialist through and through.

(a) from start to finish
(b) from here till then
(c) from this to that
(d) from time to time

Test No. express/elem-8 "Prepositions", answer 9

It's quite clear to everyone that she's a socialist from start to finish.

Correct answer: (a) from start to finish
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as c

[Alan]

I'm not quite sure what your question is but this expression means completely or totally.
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