What is the meaning of "Yeyeilil Mo'av l'Mo'av"?
Rashi: Mo'av laments Al Mo'av (on behalf of itself). Malbim - others will not lament over them, for they had counsel to be saved, but amidst pride, they did not heed it.
Radak: The remaining Mo'avim should lament over those who were killed.
Why does it say "Kulah Yeyeilil"?
Malbim: The entire country fell.
What is the meaning of "Ashishei"?
Rashi: They are the [Malbim - fortified] walls. This is like "Naflu Eshyoseha" (Yirmeyah 50:15).
Radak: They are the foundations. This is like "Naflu Eshyoseha" (Yirmeyah 50:15). Also in Arame'ic, it says "v'Ushaya Yachitu" (Ezra 4:12). This is a parable for the greats of Mo'av.
Malbim: They are strong fortresses.
What is "Kir Chareses"?
Radak (11): It is a city of Mo'av. Below (11), it is called "Kir Cheres."
Radak (Yirmeyah 48:31, citing Targum Yonasan): Their strong walled city.
What is the meaning of "Tehgu Ach Necha'im"?
Rashi: Lament those who were broken (wounded).
Radak: You wounded who remain - make loud sounds and moan. Tehgu is like "Ehgeh ka'Yonah" (Yeshayah 38:14). Necha'im is like "v'Nich'e Levav" (Tehilim 109:16).
Malbim: They will not take men there to fight from the wall. They will take 1 only those wounded, to heal there.
Malbim: This is removal, like "Hagu Sigim mi'Kasef" (Mishlei 25:4), "Ka'asher Hogah Min ha'Mesilah" (Shmuel II, 20:13). All verbs that refer to removal, when the following word [is El, or - PF] has the prefix Lamed, they mean bringing close, e.g. "Hotzi'em Eleinu" (Bereishis 19:5), "Surah Elai" (Shoftim 4:18). When the following word has the prefix Mem, they mean distancing - Hotzi'u Kol Ish me'Alai" (Bereishis 45:1), "Suru Mimeni" (Tehilim 6:9).