melt vs slip through the cracks

melt

verb
  • To be discouraged. 

  • To be emotionally softened or touched. 

  • To change (or to be changed) from a solid state to a liquid state, usually by a gradual heat. 

  • To soften, as by a warming or kindly influence; to relax; to render gentle or susceptible to mild influences; sometimes, in a bad sense, to take away the firmness of; to weaken. 

  • To dissolve, disperse, vanish. 

  • To be very hot and sweat profusely. 

noun
  • A melt sandwich. 

  • A wax-based substance for use in an oil burner as an alternative to mixing oils and water. 

  • The springtime snow runoff in mountain regions. 

  • Molten material, the product of melting. 

  • The transition of matter from a solid state to a liquid state. 

  • Rock showing evidence of having been remelted after it originally solidified. 

  • An idiot. 

slip through the cracks

verb
  • To escape notice or lack sufficient attention. 

How often have the words melt and slip through the cracks occurred in a corpus of books? (source: Google Ngram Viewer )