Phrasal verb turn out

[sammie]

Test No. incompl/inter-34 "Story (3)", question 9

You see I've just turned all the lights ......... ready for the night.

(a) out
(b) in
(c) on
(d) up

Test No. incompl/inter-34 "Story (3)", answer 9

You see I've just turned all the lights out ready for the night.

Correct answer: (a) out

Your answer was: incorrect
You see I've just turned all the lights on ready for the night.
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what is the meaning of "to turn the light out"?Please explain it in a brief.(question)

[Alan]

Turn out the lights = switch off the lights
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