expand vs qualify

expand

verb
  • To express (something) at length and/or in detail. 

  • To become, by rewriting, a longer, yet equivalent sum of terms. 

  • To feel generous or optimistic. 

  • To multiply both the numerator and the denominator of a fraction by the same natural number yielding a fraction of equal value 

  • To change (something) from a smaller form or size to a larger one; to spread out or lay open. 

  • To change or grow from smaller to larger in form, number, or size. 

  • To rewrite (an expression) as a longer, yet equivalent sum of terms. 

  • To increase the extent, number, volume or scope of (something). 

  • To increase in extent, number, volume or scope. 

  • To speak or write at length or in detail. 

qualify

verb
  • To describe or characterize something by listing its qualities. 

  • To certify or license someone for something. 

  • To throw and catch each object at least twice. 

  • To compete successfully in some stage of a competition and become eligible for the next stage. 

  • To make someone, or to become competent or eligible for some position or task. 

  • To modify, limit, restrict or moderate something; especially to add conditions or requirements for an assertion to be true. 

  • To give individual quality to; to modulate; to vary; to regulate. 

noun
  • An instance of throwing and catching each prop at least twice. 

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