הֲבֵאתָ֥נוּ בַמְּצוּדָ֑ה שַׂ֖מְתָּ מוּעָקָ֣ה בְמָתְנֵֽינוּ׃
Thou didst bring us into the hold; Thou didst lay constraint upon our loins.
Rashi on Psalms
You brought us into a trap A narrow place, like in a prison.
Rashi on Psalms
a chain Heb. מועקה, an expression of locking up, and every [expression of] מֵעִיק and מֵצִיק is like it.