couple vs unlock

couple

verb
  • To join (two things) together, or (one thing) to (another). 

  • To cause (two animals) to copulate, to bring (two animals) together for mating. 

  • To join in sexual intercourse; to copulate. 

adj
  • Two or (a) small number of. 

noun
  • A small number. 

  • That which joins or links two things together; a bond or tie; a coupler. 

  • A couple-close. 

  • Two partners in a romantic or sexual relationship. 

  • One of the pairs of plates of two metals which compose a voltaic battery, called a voltaic couple or galvanic couple. 

  • Two of the same kind connected or considered together. 

  • A turning effect created by forces that sum to zero in magnitude but produce a non-zero external torque. 

det
  • Two or a few, a small number of. 

unlock

verb
  • To make available. 

  • To undermine something that has control over a situation; to find a way to counter or oppose. 

  • To configure (a mobile phone) so that it is not bound to any particular carrier. 

  • To undo or open a lock or something locked by, for example, turning a key, or selecting a combination. 

  • To obtain access to something; to meet the requirements of a security or protection system. 

  • To disclose or reveal previously unknown knowledge or potential. 

  • To be or become unfastened or unrestrained. 

noun
  • The act of unlocking something. 

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