Mark 11:9 New English Translation

⁹Both those who went ahead and those who followed kept shouting, “Hosanna!^[a] Blessed is the one who comes in the name of the Lord!^[b]

Mark 11:9 tn The expression ῾Ωσαννά (hōsanna, literally in Hebrew, “O Lord, save”) in the quotation from Ps 118:25-26 was probably by this time a familiar liturgical expression of praise, on the order of “Hail to the king,” although both the underlying Aramaic and Hebrew expressions meant “O Lord, save us.” The introductory ὡσαννά is followed by the words of Ps 118:25, εὐλογημένος ὁ ἐρχόμενος ἐν ὀνόματι κυρίου (eulogēmenos ho erchomenos en onomati kuriou), although in the Fourth Gospel the author adds for good measure καὶ ὁ βασιλεὺς τοῦ ᾿Ισραήλ (kai ho basileus tou Israēl). In words familiar to every Jew, the author is indicating that at this point every messianic expectation is now at the point of realization. It is clear from the words of the psalm shouted by the crowd that Jesus is being proclaimed as messianic king. See E. Lohse, TDNT 9:682-84.sn Hosanna is an Aramaic expression that literally means, “help, I pray,” or “save, I pray.” By Jesus’ time it had become a strictly liturgical formula of praise, however, and was used as an exclamation of praise to God.
Mark 11:9 sn A quotation from Ps 118:25-26.

New English Translation (NET)