JMdict: 1254190

決め込む 【きめこむ】

  1. [v5m,vt] to take for granted; to assume; to be convinced (that); to jump to the conclusion (that)
  2. [v5m,vt] to pretend (to be); to pose (as); to fancy oneself (to be); to feign (e.g. ignorance)
  3. [v5m,vt] to go through with (what one decided to do); to persist in doing; to make up one's mind
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
決 Decide, Fix, Agree Upon, Appoint ケツ き.める, -ぎ.め, き.まる, さ.く 3
込 Crowded, Mixture, In Bulk, Included, (kokuji) null -こ.む, こ.む, こ.み, -こ.み, こ.める