A social and economic class lying above the lower middle class and below the upper class.

plural of upper crust

Used other than figuratively or idiomatically: see upper, crust. The topmost layer of a bread, pastry dish, or other item with a hardened coating.

Alternative form of upper-crust

(idiomatic) The quality of being resolute and showing self-restraint, stereotypically associated with the British; especially as keep a stiff upper lip.

(anatomy) The sphincter situated at the upper part of the esophagus.

plural of upper / The parts of a pair of shoes that do not normally contact the ground.

simple past tense and past participle of up

(US, military, nautical) A flag officer in the United States Navy, United States Coast Guard, National Oceanic and Atmospheric Administration Commissioned Corps, or Public Health Service Commissioned Corps of a grade superior to a rear admiral (lower half) and junior to a vice admiral. A rear admiral (upper half) is equal in grade or rank to an Army, Marine Corps, or Air Force major general. A rear admiral (upper half) wears a two star insignia on most uniforms and a gold stripe above a broad gold stripe on the sleeve of certain dress uniforms.

(rare) simple past tense and past participle of big up