Out of equilibrium, unsteady, as in When learning how to ride a two-wheeler, it's easy to get off balance and fall, or She stood up and threw the canoe off balance. [Mid-1900s]
Surprised, unprepared, as in The teacher gives unannounced tests to keep the class off balance. [Second half of 1900s]
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.