they had crumbled
-avaient émietté
Past perfect they conjugation of crumble.
See all conjugations of crumble

crumble

Several stones had at different times been chosen, but under the pressure of immense weights they had crumbled to pieces.
Les diverses pierres qu'on avait essayées s'étaient effritées sous le poids auquel elles avaient été soumises.
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