second string vs temp

second string

adj
  • Not as good; of a lower quality or condition. 

noun
  • A unit of players which is considered to have a secondary level of talent and which usually plays after the first string. 

temp

noun
  • A temporary employee, usually in an office. 

  • A temporary storage location. 

verb
  • To work as a temporary employee. 

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