1to 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 打破〔状况、关系或艺术作品〕的平衡
Having children can often unbalance even the closest of relationships.
有了孩子,即使最亲密的关系也常常会失衡。
2to make someone or something unsteady, so that they are likely to fall down 使失去重心[平衡]
He banged against the cupboard, unbalancing a pile a books.