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I came a cross the expression かげぐち【陰口】(backbiting) and found it in my dictionary as follows

人の陰口をきく[たたく]|[speak ill of a person / run a person down] behind his back / backbite

When I tried to look up the meaning of きく the only transitive verbs that seem possible are 聞く& 聴く. However these relate to listening or at best "asking" which does not seem to be quite same thing.

Should I just accept such expressions as idioms? Even if that is the correct course it seems odd that the entry for 聞く does not mention this use.

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Actually, it's not 聞く(listen). Try "口を利く". – Sindry Jan 14 '13 at 5:32
Found it. Thanks. (For some reason when I looked at this before I could only find intransitive uses of 利く.) If you make an answer I'll give you credit. – Tim Jan 14 '13 at 5:49
For posterity's sake, here's a direct link to a native definition of 口を利く。 kotobank.jp/word/%E5%8F%A3%E3%82%92%E5%88%A9%E3%81%8F – Ncat Jan 16 '13 at 3:53
theres that 陰 kanji again :/ – yadokari Feb 19 '13 at 4:37
@yadokari We all have a 陰 following us around... – snailplane Feb 19 '13 at 5:40

As per meta, I shamelessly take Sindry's comment and make it an answer.

My dictionary (gjiten) says 口を利く means "to speak, to utter, to mediate".

The same dictionary says 利く is intransitive, so it is probably an idiom.

口を利く in another dictionary.

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