verb. weigh more heavily.
verb. cause to be off balance.
Example sentences of the word overbalance
1. Verb, base form
A child leaning too far into the bowl could overbalance and drown, and a plummeting toilet seat could concuss a child or break small fingers.
2. Noun, singular or mass
And the result is 1) an overbalance of sound and 2) excess distortion.