Why should he publicize the fall of Bavel among the Goyim?
Radak: It is because Nebuchadnetzar destroyed all the nations.
Why does it say "Hagidu" and "Hashmi'u"?
Malbim: Announce publicly, and give all the details.
What is "Nes"?
Rashi: It is a flag, a sign of gathering.
What are "Bel" and "Merudach"?
Rashi: They are names of idolatries of Bavel.
What should "Bel" and "Merudach" be ashamed and afraid?
Radak: [These idolatries of Bavel] could not save those who served them.
What is the grammatical form of "Chas"?
Radak: It is a verb in past tense, like "Tam Avonech" (Eichah 4:22). The root is Chasas 1 .
Surely 'Tachas' is a printing mistake. (PF)