To eat or drink; to put something in one's mouth and taste or consume it.
このスープは初めて口にしたが、とてもおいしかった。
I tasted this soup for the first time, and it was very delicious.
彼は辛い物を口にするとすぐにむせてしまう。
If he puts spicy food in his mouth, he immediately chokes.
赤ちゃんに初めて固形物を口にさせるときは慎重に与える。
When giving a baby solid food for the first time, you should do so carefully.
To mention or speak of something; to put into words or refer to a topic.
彼はその件についてはまだ口にしていない。
He hasn't mentioned that matter yet.
そんなことを口にするべきではない。傷つく人がいるかもしれない。
You shouldn't say things like that. Someone might get hurt.
会議で初めてその問題を口にしたのは田中さんだった。
Tanaka was the first to bring up that issue at the meeting.