Sentence

利口だね。

利口(りこう)だね。
He is smart.
Sentence

彼は早口だ。

(かれ)早口(はやくち)だ。
He is a fast speaker.
Sentence

口を出すな。

(くち)()すな。
You keep out of this.
Sentence

口は禍の門。

(くち)(わざわい)(もん)
The tongue wounds more than a lance.
Sentence

口ばっかり!

(くち)ばっかり!
You're all talk and no action!
Sentence

彼は口が重い。

(かれ)(くち)(おも)い。
He is a man of few words.
Sentence

彼は口が堅い。

(かれ)(くち)(かた)い。
He is a tight-lipped man.
Sentence

死人に口なし。

死人(しにん)(くち)なし。
Dead men tell no tales.
Sentence

口添えしてね。

口添(くちぞ)えしてね。
Please put in this way.
Sentence

口数が多いぞ。

口数(くちかず)(おお)いぞ。
You talk too much.