What does rehash mean?

[Heiner]

Business English Lesson, Advanced Level

ESL/EFL Test #566 "Pushing and Pulling", question 1

Chesterfield suggests that the traditional hierarchical model of planning which places communications alongside the other marketing mix variables is due for a ..........

(a) recall
(b) rehash
(c) rethink
(d) reverb

Business English Lesson, Advanced Level

ESL/EFL Test #566 "Pushing and Pulling", answer 1

Chesterfield suggests that the traditional hierarchical model of planning which places communications alongside the other marketing mix variables is due for a rethink.

Correct answer: (c) rethink
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explain rehash

[Mister Micawber]

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Don't you have a DICTIONARY?
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Native English teacher at Mister Micawber's