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to address (someone); to accost a person; to talk (to someone)
to begin to talk; to start a conversation
電車で隣の人に話しかけるのは勇気がいる。
It takes courage to talk to the person next to you on the train.
彼女に勇気を出して話しかけた。
I mustered courage to speak to her.
迷子の子供に優しく話しかけて落ち着かせた。
I gently spoke to the lost child and calmed them down.