Difference between 'turn down and 'turn off'

[av]

Test No. incompl/inter-65 "How to ask a question", question 5

I would be most interested to know why the committee has turned ......... my proposal.

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

Test No. incompl/inter-65 "How to ask a question", answer 5

I would be most interested to know why the committee has turned down my proposal.

Correct answer: (a) down

Your answer was: incorrect
I would be most interested to know why the committee has turned off my proposal.
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hipls explain to me why the sentence use turn down not use turn off
tks

[Alan]

Turn down means reject/dismiss - not accept. Turn off is used in the sense of stop a machine for example in the sense of switch off. You turn off a car engine when you arrive/You turn off a light when you leave the room.
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English as a Second Language
You can read my ESL story Cool Expressions

[Guest]

[Mister Micawber]

.
Turn out works only with illumination. The light then goes out (becomes extinguished).

We cannot 'turn out' other types of equipment, machinery or appliances. We turn off an oven, a washing machine, an automobile engine, and yes, a light as well.
.
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Native English teacher at Mister Micawber's