un ‧ bal ‧ ance /ʌnˈbæləns/ BrE AmE verb [transitive]
1 . to make a situation, relationship, or work of art not as good as it used to be or could be, especially by adding too much of one thing:
Having children can often unbalance even the closest of relationships.
2 . to make someone or something unsteady, so that they are likely to fall down:
He banged against the cupboard, unbalancing a pile a books.
3 . to make someone slightly crazy