<p><strong>Noun</strong></p><ul><li>Fortification</li><li>a long, narrow excavation in the ground, the earth from which is thrown up in front to serve as a shelter from enemy fire or attack</li><li>trenches, a system of such excavations, with their embankments, etc.</li><li>a deep furrow, ditch, or cut</li><li>Oceanography, a long, steep-sided, narrow depression in the ocean floor</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to surround or fortify with trenches; entrench</li><li>to cut a trench in</li><li>to set or place in a trench</li><li>to form (a furrow, ditch, etc.) by cutting into or through something</li><li>to make a cut in; cut into; carve</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to dig a trench</li></ul><p><strong>Verb phrase</strong></p><ul><li>to encroach or infringe on</li><li>to come close to; verge on: His remarks were trenching on poor taste</li></ul>