<p><strong>verb</strong></p><ul><li>(used with object), crum·bled, crum·bling.<ul><li>to break into small fragments or crumbs.</li></ul></li></ul><p><strong>noun</strong></p><ul><li>a crumbly or crumbled substance.</li><li>crumbles, bits of crisp bacon, bread, etc., added to other foods, especially as a topping.</li><li>British Dialect. crumb; particle; fragment.</li></ul>