A master or expert; someone who is highly skilled or accomplished in a particular art or field.
彼は和食の達人で、どんな食材でも美味しく料理する。
He is a master of Japanese cuisine and can cook any ingredient deliciously.
将棋の達人になるには長年の修練が必要だ。
Becoming a shogi master requires years of training.
彼女は写真の達人として知られている。
She is known as an expert photographer.