1)
What is "Metzudah"?
1.
Rashi: It is a narrow place, like a jail cell.
2.
Radak: It is a fortress. One trapped in a fortress has no way to escape, if not via a miracle.
2)
What is "Mu'akah"?
1.
Rashi: It is an expression of fetters. The same applies to every Me'ik and Metzik.
2.
Radak: It is evil that constricted our loins. We had no strength to stand from it. This is To'ar (kind of object).
3.
Malbim: It is iron fetters. They put them on Menasheh, so he could not move.
