overture

昨日は朝から卓球の試合があったのでブログを休みました。普段はほとんど練習をしないラージボールの試合で成績は散々でした。
さて、White Fangを見世物の闘犬として手に入れたのはBeauty Smithですが、彼とWhite Fangの出会いの個所です。
This was the man that looked at White Fang, delighted in his ferocious prowess, and desired to possess him. He made overture to White Fang from the first. White Fang began by ignoring him. Later on, when the overtures became more insistent, White Fang bristled and bared his teeth and backed away.
"overture" は序曲の意味しか知らないのですが、ここでの意味は何でしょう？　辞書を引きます。
・Oxford Dictionary: (usually overtures) An approach or proposal made to someone with the aim of opening negotiations or establishing a relationship: Coleen listened to his overtures of love.
・Merriam-Webster: something that is offered or suggested with the hope that it will start a relationship, lead to an agreement, etc.: The government has made a significant peace overture by opening the door to negotiation.
なるほど、"overture" は音楽用語専用ではないのですね。