Compounds of 凝らす

• 凝らす
  (v5s,vt) (1) to freeze
  to congeal
  (2) to concentrate one's attention on
  to devote oneself to something
  to ponder
  to meditate
• 凝らす
  (v5s,vt) to concentrate
  to devote
  to apply
  to strain
  to rack
• 瞳を凝らす
  (exp) to strain one's eyes
• 思案を凝らす
  (exp) to rack one's brains (i.e. for a solution)
• 趣向を凝らす
  (exp) to elaborate a plan
  to think up something clever for variety's sake