What does this phrasal verb mean: 'to take over'? Is it an idiom?

[dzungqn]

Test No. incompl/inter-5 "do/make/get/take", question 9

We mustn't be late this morning because today is when the new boss is going to ......... over.

(a) do
(b) get
(c) make
(d) take

Test No. incompl/inter-5 "do/make/get/take", answer 9

We mustn't be late this morning because today is when the new boss is going to take over.

Correct answer: (d) take

Your answer was: incorrect
We mustn't be late this morning because today is when the new boss is going to get over.
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I dont understand why we use "to take over" for this sentence. please explain.

[Torsten]

In this sentence to take over means to start a job, assuming a responsibility, being responsible.
Two employees are talking about the fact that tomorrow the next day their new boss is starting his job and that's why they must make sure they arrive on time.
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