under glassRate this phrase:(5.00 / 1 vote)Say it
In a greenhouse, a cold frame, or a similar structure; said of the propagation and growth of plants.

Additional definitions for 'under glass':

under glassIn a glass case, like an item in a museum.
under glassIn jail.
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"under glass." Phrases.net. STANDS4 LLC, 2018. Web. 19 Feb. 2018. <http://www.phrases.net/phrase/under-glass_15566>.

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