Matthew Poole and continuators on Lamentations 2:8

8 The LORD hath purposed to destroy the wall of the daughter of Zion ; he hath stretched out a line , he hath not withdrawn his hand from destroying : therefore he made the rampart and the wall to lament; they languished together .

The term Wall in this verse seemeth to be taken in a metaphorical sense, for the strength and security of the Iews (the strength and security of a place lying much in its Walls.)

Artificers use with lines not onely to mark out places for building, but also for destruction, to direct them what to cut off, such a line is here meant.

God had gone on in destroying them.

And had made their Walls and Ramparts feeble, and to shake like a man under some languishing distemper, that had no strength left.

Marginal references: 2 Kin. 21.13. Isa. 34.11.; Heb. swallowing up.