knock back vs snub

knock back

verb
  • To reject; to refuse. 

  • To drink an alcoholic beverage swiftly or often. 

  • To stun; to surprise. 

  • To press or knead (dough) so as to remove air bubbles. 

snub

verb
  • To turn down insultingly; to dismiss. 

  • To slight, ignore or behave coldly toward someone. 

  • To check; to reprimand. 

  • To halt the movement of a rope etc by turning it about a cleat or bollard etc; to secure a vessel in this manner. 

  • To sob with convulsions. 

  • To stub out (a cigarette etc). 

  • To clip or break off the end of; to check or stunt the growth of. 

adj
  • Derived from a simpler polyhedron by the addition of extra triangular faces. 

  • Conspicuously short. 

  • Flat and broad, with the end slightly turned up. 

noun
  • A deliberate affront or slight. 

  • A sudden checking of a cable or rope. 

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