overbalance vs pair off

overbalance

verb
  • To throw (someone or something) off balance; to cause to capsize. 

  • To lose one's balance; to fall over. 

  • To be more important than; to outweigh. 

  • To cause an imbalance in (something) by means of excess weight or numbers. 

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

pair off

verb
  • To join two people into a relationship. 

  • To separate into groups of two. 

How often have the words overbalance and pair off occurred in a corpus of books? (source: Google Ngram Viewer )