Difference between holding fort and holding brief?

[Zorro]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #47 "House/Building Idioms (1)", question 3

My mother left for Europe on Friday. She asked me to hold the fort while she's away.

(a) be the temporary manager
(b) build a house
(c) leave the house

English Idioms and Expressions, Advanced Level

ESL/EFL Test #47 "House/Building Idioms (1)", answer 3

My mother left for Europe on Friday. She asked me to be the temporary manager while she's away.

Correct answer: (a) be the temporary manager
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Is there any difference between holding fort and holding brief?

Zorro

[Mister Micawber]

Yes. They are unrelated. Most IDIOMS can be found in online DICTIONARIES.
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Native English teacher at Mister Micawber's