flinch vs tremble

flinch

verb
  • To make a sudden, involuntary movement in response to a (usually negative) stimulus; to cringe. 

  • To dodge (a question), to avoid an unpleasant task or duty 

  • To let the foot slip from a ball, when attempting to give a tight croquet. 

noun
  • The slipping of the foot from a ball, when attempting to give a tight croquet. 

  • A reflexive jerking away. 

tremble

verb
  • To shake, quiver, or vibrate. 

  • To fear; to be afraid. 

noun
  • A shake, quiver, or vibration. 

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