JMdict: 2079440

腹をくくる 【はらをくくる】

  1. [exp,v5r] to prepare oneself for the worst; to strengthen one's resolve; to accept one's fate; to prepare oneself
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
腹 Abdomen, Belly, Stomach フク はら 6