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to address (someone); to accost a person; to talk (to someone)
to begin to talk; to start a conversation
街で見知らぬ人に話し掛けられた。
A stranger spoke to me on the street.
彼女は勇気を出して彼に話し掛けた。
She gathered her courage and spoke to him.
見知らぬ人に話し掛けるのは少し緊張する。
Talking to strangers makes me a little nervous.