transitive. To crush; †to make a deep wound in; to gash. Also †intransitive for reflexive. To crumble.

intransitive. To fall into crumbs; to crumble. Obsolete.

intransitive. To fall asunder in small crumbs or particles; to become pulverized.

intransitive. To crumble.

intransitive. To crumble, break easily into crumbs; to moulder. Also with away, down.

Of lime, etc.: To become disintegrated under the action of moisture.

Of earth: To fall or crumble in pieces. Also with down. ? dialect. (Cf. 2e.)

To come apart, break into pieces, disintegrate (without the notion of toppling to the ground). intransitive. Scottish and English regional…