凝らす
  こごらす
  Godan verb with `su' ending
  transitive verb
  to freeze
  to congeal
  to concentrate one's attention on
  to devote oneself to something
  to ponder
  to meditate
  凝らす
  こらす
  Godan verb with `su' ending
  transitive verb
  to concentrate
  to devote
  to apply
  to strain
  to rack
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