“A remedy for an escape from enemies' siege is cut off. "He has walled me about so that I cannot escape." That is, by the besieging army. "He has put heavy chains on me." This indicates that I (Jeremiah) am besieged just like those persons who are sent to prison and cannot escape. Thus, Psalm 88:8 claims: "I am shut in…”
Thomas Aquinas, 13th c. — Commentary on Lamentations
Original
7He hath hedged me about, that I cannot get out: he hath made my chain heavy.
Modern
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In context
5He hath builded against me, and compassed me with gall and travail.
6He hath set me in dark places, as they that be dead of old.
— Lamentations 3:7 —
8Also when I cry and shout, he shutteth out my prayer.
9He hath inclosed my ways with hewn stone, he hath made my paths crooked.