under glass

:  in or into a position below or beneath something

:  below or short of some quantity, level, or limit

:  in or into a condition of subjection, subordination, or unconsciousness

:  below or beneath so as to be overhung, surmounted, covered, protected, or concealed by

:  subject to the authority, control, guidance, or instruction of

:  receiving or undergoing the action or effect of

:  lower in rank or authority :  subordinate

:  any of various amorphous materials formed from a melt by cooling to rigidity without crystallization: such as

:  a usually transparent or translucent material consisting typically of a mixture of silicates

:  a material (such as obsidian) produced by fast cooling of magma

:  to provide with glass :  glaze

:  to enclose, case, or wall with glass

:  to make glassy