<p><strong>Verb</strong></p><ul><li>to lay under or beneath.</li><li>to provide with something laid underneath; raise or support with something laid underneath: The manufacturer underlays the chrome finish with a zinc coating.</li><li>to extend across the bottom of.</li></ul><p><strong>Noun</strong></p><ul><li>something underlaid.</li><li>Printing: a piece or pieces of paper put under type or cuts to bring them to the proper height for printing.</li></ul>