- coarse cloth such as sacking
- garments made of such cloth, worn formerly to indicate mourning or penitence
- sackcloth and ashes ⇒ a public display of extreme grief, remorse, or repentance
WordReference Random House Learner's Dictionary of American English © 2014
- in sackcloth and ashes, [uncountable] in a state of deep sorrow for what one has done.