決め込む
kimekomu
to take for granted, to assume, to be convinced (that), to jump to the conclusion (that)
All Senses
  1. kimekomu to take for granted, to assume, to be convinced (that), to jump to the conclusion (that); to pretend (to be), to pose (as), to fancy oneself (to be), to feign (e.g. ignorance); to go through with (what one decided to do), to persist in doing, to make up one's mind
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Kanji Breakdown
Decide, Fix, Agree Upon, Appoint
On: けつ Kun: き.める,-ぎ.め,き.まる,さ.く
7 strokes N3
Crowded, Mixture, In Bulk, Included, (kokuji)
Kun: -こ.む,こ.む,こ.み,-こ.み,こ.める
5 strokes N3
How to Use This Word
U-verb (五段動詞)
Pattern
決め込む (dict) → polite: -ます form → て-form → た-form

💡 Conjugate the final kana to the い-row before adding ます.

Example
よく決め込むことがあります。
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