overbalance

Short definition from Wiktionary

Verb

1. 1
   To be more important than; to outweigh.
2. 2
   To cause an imbalance in (something) by means of excess weight or numbers.
3. 3
   To throw (someone or something) off balance; to cause to capsize.
4. 4
   To lose one's balance; to fall over.

Noun

1. 1
   Excess of weight or value; something more than an equivalent.