(idiomatic) A person who participates in entertainment events in a very enthusiastic manner and who has a leading role in inspiring others to join in the spirit of festivity.

Alternative spelling of behind the scenes

(US, dialectal, Appalachia) Them there, meaning those.

Alternative spelling of off the books (preceding a noun only)

(idiomatic, informal, UK, Australia) So obvious that it was unnecessary to say.

A theory of how people positively and negatively value things and concepts, the reasons they use in making their evaluations, and the scope of applications of legitimate evaluations across the social world.

(colloquial, idiomatic) To fully grasp the meaning of a concept or developed a skill to a high degree of proficiency, often that rivals some specific expert.

present participle of run the gauntlet

A form of physical punishment by which a person is compelled to run through a double line of soldiers who attempt to strike him as they pass

Exceeding the normal range of measurement.