to make sb / sth unsteady and in danger of falling
(catch / throw sb) off balance
to make sb / sth unsteady and in danger of falling
I was thrown off balance by the sudden gust of wind.
(catch / throw sb) off balance
to make sb surprised and no longer calm
The senator was clearly caught off balance by the unexpected question.
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition