Palm branches: The date palm symbolized pride in the Jewish nation and celebration.
meet Him: The Greek word often describes crowds welcoming a king returning in triumph from a war.
Blessed is He: The crowd quoted Psalm 118:25–26, with a greeting for those who came to Jerusalem.
The phrase "Blessed is the King of Israel!" is not in the psalm (but see Zephaniah 3:15). Although the people saw Jesus as a national political liberator, he rejected this role (John 6:15).