<p><strong>Adjective:</strong></p><ul><li>Extremely full; crowded; jammed.<ul><li>Example: A room chockablock with furniture and plants.</li></ul></li><li>Nautical: Having the blocks drawn close together, as when the tackle is hauled to the utmost.</li></ul><p><strong>Adverb:</strong></p><ul><li>In a crowded manner.<ul><li>Example: Books piled chockablock on the narrow shelf.</li></ul></li></ul>