(chemistry) one of the isomeric dicarboxylic acids produced by the distillation of citric acid, or as metabolites by microorganisms, CH₂=C(CO₂H)-CH₂CO₂H

To have accomplished all there is to do; to have no further work or difficulty. / To have achieved a lifestyle characterized by good fortune and comfort.

(idiomatic, colloquial) To be authentic, true to oneself; to be cool. / (idiomatic, colloquial) In the imperative, an exhortation used as a departing salutation.

(slang) Aware of current trends and fashions. / (slang) Attentive, alert; often encountered in the negative ‘not with it’ - not understanding, not alert

Used other than figuratively or idiomatically: see get, it, on. / (slang) To have sex. / (slang) To engage in a fight. / (idiomatic) To hurry up; to get a move on.

(idiomatic, dialect, slang) Indicates agreement, approval, encouragement.

(informal) To develop an amicable relationship (with), especially in a sudden manner during an initial encounter.

(idiomatic) To leave something to follow its natural course.

Alternative form of you can't judge a book by its cover

(US, slang) A luxury item. Although commonly referring to an item of significant physical size (e.g. a computer, sports car or big screen television), the term can be applied to any expensive item.