Wiktionary
prep.phr. 1 (context literally horticulture English) In a greenhouse, a cold frame, or a similar structure; (non-gloss definition: said of the propagation and growth of plants.) 2 In a glass case, like an item in a museum. 3 (context idiomatic slang English) In jail.
Wikipedia
Under Glass is the second studio album by Hash Jar Tempo, released on March 23, 1999 by Drunken Fish Records.
Usage examples of "under glass".
The Visitors were regaled with tiny sandwiches and petits fours at teatime, pheasant under glass and filets mignons for dinner, and chocolates on the pillow at night.
It was isolated from the lifeless planet on which it was located by a force field, but the rooms were built about a five-acre farm (under glass, of course), which, in the planet's beneficent sunlight, grew flowers for pleasure and vegetables for health.
K'leb just looked from one to the other of them, his eyes darting like insects trapped under glass.
The decor looked as if it had been assembled in one day by someone with respect for convention, a tight deadline, and a nervous budget: middling antique copies, equine prints under glass, the kind of still-life paintings you can pick up at sidewalk sales.
The gliders were clear and vivid to him, and the uniformed men busy with them were as sharply and minutely visible as a nest of ants under glass.
And instead, it only gave her a morbid loathing of that hideous hotel bedroom drowned in yellow rain-light, of the smell of soot and cabbage through the window, the blistered wall-paper, the dusty wax bouquets under glass globes, and the electric lighting so contrived that as you turned on the feeble globe hanging from the middle of the ceiling the feebler one beside the bed went out!
The engineers love it because they like their issues dead and crucified like butterflies under glass.
The cards were just like Flora's and they held us all under glass and were cold to the touch.