Meaning of 端座坐 in Japanese

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Definition of 端座坐

すわる(suwaru) 【座る ·坐る ·据わる ·据る】

(v5r, vi) to sit; to squat
数人の学生がベンチに座り、昼食を食べていた。
Some students were sitting on the bench and having lunch.
to assume (a position)
to hold steady; to hold still

たんざ(tanza) 【端座 ·端坐】