plaint (n.)

"expression of sorrow," c. 1200, from Old French plainte "lament, lamentation" (12c.), from Latin planctus "lamentation, wailing, beating of the breast," from past participle stem of plangere "to lament; to strike (the breast, in grief or mourning)," from PIE root *plak- (2) "to strike." Connecting notion probably is beating one's breast in grief.

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