JMdict: 1358180

食い込む 【くいこむ】

  1. [v5m,vi] to bite into (e.g. rope into skin); to cut into; to dig into (e.g. of fingernails)
  2. [v5m,vi] to eat into; to encroach; to make inroads; to penetrate (e.g. a market); to break into (e.g. first place); to erode; to cut into (e.g. time, savings)
  3. [v5m,vi] to be wedged (i.e. underwear pulled from the back, driving it between the buttocks)
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
食 Eat, Food ショク, ジキ く.う, く.らう, た.べる, は.む
込 Crowded, Mixture, In Bulk, Included, (kokuji) null -こ.む, こ.む, こ.み, -こ.み, こ.める