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To surround or encircle something with glass. A noun or pronoun can be used between "glass" and "in." I think the architect plans to glass in the atrium.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
glass something in
to enclose something, such as a porch, in glass. I want to glass this porch in, so we can use it in the winter. We glassed in our porch last year.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To surround or enclose something with glass: We glassed in the side porch to keep it warmer in winter.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.