Meaning of 'to step down'

[doanngockhanh]

Test No. incompl/advan-38 "Are You in Debt?", question 4

One director of a major credit company has already been forced to ......... because of the bad publicity his company has attracted.

(a) step over
(b) step through
(c) step down
(d) step out

Test No. incompl/advan-38 "Are You in Debt?", answer 4

One director of a major credit company has already been forced to step down because of the bad publicity his company has attracted.

Correct answer: (c) step down
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Dear Sir,
I wonder why we use "step down" here instead of step over.What does it mean?
Thank you very much

[Alan]

This means leave your job/post.
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English as a Second Language
You can read my ESL story The Name of the Game