Definition of rathole
1a : a rat's burrow b : a hole gnawed by a rat
2a : a narrow opening, tunnel, or passageway b : a cramped space (as for storage or living quarters); especially : one that is oppressive or filthy cooped up in a rathole like this — Jack Ward
3 : a seemingly bottomless or unfillable hole his last pile of money … went down the rathole when he tried to save an old friend from bankruptcy — Stanley Walker
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