1)
What is the meaning of "Tzarim"?
1.
Rashi: They were besieging.
2)
What is "Chatzer ha'Matarah"?
1.
Rashi: It is a place of confinement. Radak - the root of Matarah is Natar, a matter of guarding, like "ha'Yintor l'Olam" (3:5).