Compounds of びく

• びくっと
  (adv) with a start
• びくつく
  (v5k,vi) to be scared
• びくびく
  (adv,n,vs,adj-no) (on-mim) being afraid of
  being fearful
  being timid
  being nervous
  (P)
• ちびくろサンボ
  (n) Little Black Sambo (book title)
• びくともしない
  (adj-i) (1) unperturbed
  undaunted
  retaining composure
  (2) unyielding
  not giving an inch