Rashi: The flesh of My nation.

Radak: They did a terrible destruction of Aniyim.

Rashi: They opened them, to take out the marrow ¹ . Malbim ? after they ate the flesh and flayed the skin, there was nothing else to steal from them! Therefore, they opened the bones to seek marrow.

Radak: It is breaking.

Rashi: They break limbs like they break sections [of the animal] put in a pot to cook. U'Farsu is an expression of breaking, like "Faros la'Ra'ev [Lachmecha] (Yeshayah 58:7), "Peresah Tziyon" (Eichah 1:17).

Radak: They break the bones and cut the flesh like one who wants to put them in a pot. This depicts the awesome evil that they did to poor and weak people. "U'Farsu" is cutting - "Peresah Tziyon b'Yadeha", "Faros la'Ra'ev Lachmecha."

Malbim: They break the bones into two pieces, like when they put meat in a small pot (narrower than the bone).

Rashi: It is a pot ¹ . Malbim ? the bones boil until all the marrow exudes. So they press the poor monetary and bodily, until the Nefesh is crushed.