turn down means 'refuse'?

[HuongItaly]

Business Idiom in English, Intermediate level

ESL/EFL Test #128 "Ways of disapproving", question 5

I have no choice really but to turn ......... your recent proposal because it is completely unworkable.

(a) off
(b) over
(c) down
(d) across

Business Idiom in English, Intermediate level

ESL/EFL Test #128 "Ways of disapproving", answer 5

I have no choice really but to turn down your recent proposal because it is completely unworkable.

Correct answer: (c) down

Your answer was: incorrect
I have no choice really but to turn over your recent proposal because it is completely unworkable.
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So "turn down" means refuse in this case.
Could you please give me some other examples in different contexts ? The phrasal verb didn't sound familiar to me...
Thanks in advance !

[Kitosdad]

In this case the answer is "turn down", to refuse.

There are many other uses for the phrase.

Turn down the radio. (Volume.)
Turn down the bed. (Fold back the sheets.)
Turn down an invite to a party.
Turn down an offer of employment.

And so on....................
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