You, like most Americans, probably plan to run for president. You have plenty of time, theoretically; the general election is still 22 months away and even if you plan to seek the nomination of one of the major parties, those don't kick off until January.
Rearing is a common measure of activity and exploratory behavior used in the open field and sometimes in certain mazes. Nothing else. But I agree it could be related to very specific behaviors. I like the idea of escape.
birthing - the process of giving birth. giving birth, parturition, birth. brooding, incubation - sitting on eggs so as to hatch them by the warmth of the body. calving - giving birth to a calf. accouchement, childbearing, childbirth, vaginal birth - the parturition process in human beings; having a baby; the process of giving birth to a child. farrow, farrowing - the production of a litter of pigs. hatch, hatching - the production of young from an egg.