Jisho

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Godan verb with mu ending, intransitive verb
1. to bite into (e.g. rope into skin); to cut into; to dig into (e.g. of fingernails)
2. 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. to be wedged (i.e. underwear pulled from the back, driving it between the buttocks)Vulgar
Other forms
食込む 【くいこむ】

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