בֹּ֭אוּ נִשְׁתַּחֲוֶ֣ה וְנִכְרָ֑עָה נִ֝בְרְכָ֗ה לִֽפְנֵי־יְהוָ֥ה עֹשֵֽׂנוּ׃
Kommt, wir wollen uns bücken und niederbeugen, hinknien vor dem Herrn, unserm Schöpfer.
Rashi on Psalms
let us kneel Heb. נברכה, an expression of (Gen. 24:11): “He made the camels kneel (ויברך).”
Metzudat David on Psalms
Nishtachaveh- this is lying the entire body on the ground
Metzudat David on Psalms
v'Nichr'ah- this is the bending of the head and part of the body. Nivrechah- this is the bending of the knees down to the earth.