What does the phrasal verb 'turn up' mean? Is it an idiom?

[Guest]

Test No. incompl/inter-33 "Story (2)", question 1

When I turned ......... for work on my first day, the hotel had already been flourishing for 5 years.

(a) to
(b) up
(c) down
(d) over

Test No. incompl/inter-33 "Story (2)", answer 1

When I turned up for work on my first day, the hotel had already been flourishing for 5 years.

Correct answer: (b) up
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down?

[Torsten]

To turn up is a phrasal verb and means to appear/to arrive so turn up is the correct choice here.
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