In excited readiness, expectation, or desire; in or into a state of great eagerness, enthusiasm… Without construction.

In a state of agitation, excitement, exaltation, or confidence.

in (also on, upon) full scent: intent upon, or close in, pursuit of a quarry. Formerly also without preposition in the same sense. Also figurative…

atop of the house: in an uproar; in a state of excitement, passion, or rage. Now rare (regional in later use).

Stirring. figurative. In excitement.

Seething.

Horse Riding. Of a horse: overfed and under-exercised; not having undergone full training for a race. In extended use (of a person): in a heightened…