食くい込こむ

1. 1to bite into (e.g. rope into skin) ; to cut into ; to dig into (e.g. of fingernails) Translated by Jiyomi
2. 2to 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) Translated by Jiyomi
3. 3to be wedged (i.e. underwear pulled from the back, driving it between the buttocks) Translated by Jiyomi

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JMdict entry 1358180 · frequency rank 23. Source and licence.