As a noun sackcloth is
a coarse hessian style of cloth used to make sacks.
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Not English
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English
Noun
(
en noun)
A coarse hessian style of cloth used to make sacks.
(Usually paired with 'ashes'), garments worn as an act of penance. Now often used figuratively.
- After he realised the gravity of his crime he spent some time wearing sackcloth and ashes.
References
* OED2