Why does it say "Zenachtanu Peratztanu"?
Rashi: When Edom fell to David, he saw with Ru'ach ha'Kodesh that in the future, Edomiyim will rule over Yisrael and make harsh decrees. David requested mercy about subjugation in the exiles.
Radak: When Hadad'ezer Melech Tzovah went to strengthen his position on the Pras river, he took cities from Yisrael. This is because you abandoned us, and you were angry at us.
Malbim: Initially You abandoned us, and we turned away, and the enemy breached us.
What is the meaning of "Anafta"?
Rashi: You were angry at us.
Malbim: You finished Your anger against us. Therefore, return to us supremacy in war. This is like "Odecha Hashem Ki Anafta Bi Yashov Apecha u'Senachameni" (Yeshayah 12:1).
What is the meaning of "Teshovev Lanu"?
Rashi: From now, turn Your desire to us!
Radak: Turn to us with mercy.
Malbim: Refer to 60:3:2:2.