Idiom: it's your turn

[littleDA]

Test No. incompl/elem-19 "Late Again", question 9

Now, it's your ......... to tell me.

(a) bend
(b) turn
(c) corner
(d) curve

Test No. incompl/elem-19 "Late Again", answer 9

Now, it's your turn to tell me.

Correct answer: (b) turn
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The above sentence's an idiom. Could you pls explain it to me? Thanks. Nice day!

[Alan]

This means that you are next to do something.
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English as a Second Language
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