C. F. Keil and Franz Delitzsch on Lamentations 3:49-50

Lam 3:49-50 נגּר means to be poured out, empty self; cf. 2Sa 14:14; Mic 1:4. "And is not silent" = and rests not, i.e., incessantly; cf. Jer 14:17. מאין הפגות does not mean, eo quod non sint intermissiones miseriarum vel fletus (C. B. Michaelis and Rosenmüller, following the Chaldee), but "so that there is no intermission or drying up." As to הפגות, which means the same as פּוּגה, see on Lam 2:18. "Until the Lord look down from heaven and examine," in order to put an end to the distress, or to take compassion on His people. On ישׁקיף, cf. Psa 14:2; Psa 102:20.