upper crust
The social elite, the highest social class.
I judged from your remark about the diligence and industry of the high Parisian upper crust that it would have some point.
ADJ
thick, thin | pastry, pie
PHRASES
a crust of bread
My daughter nibbled on a crust of bread while we waited for lunch to be ready.
ADJ
thick, thin
VERB + CRUST
form
A layer of ice formed a hard crust on top of the frozen lake yesterday.
CRUST + VERB
form
A thick crust formed on top of the soup as it cooled overnight.
PREP
~ of
A layer of crust of salt had formed on the lake's surface after the water evaporated.
PHRASES
the earth's crust