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A hollow place or cavity; an excavation; a pit; a dent; a depression; a fissure.
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An opening that goes all the way through a solid body, a fabric, etc.; a perforation; a rent.
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(heading) In games.
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(archaeology, slang) An excavation pit or trench.
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(figuratively) A weakness; a flaw or ambiguity.
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(physics) In semiconductors, a lack of an electron in an occupied band behaving like a positively charged particle.
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(computing) A security vulnerability in software which can be taken advantage of by an exploit.
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(slang, derogatory) A person's mouth.
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(slang) Any bodily orifice, in particular the anus.
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(Ireland, Scotland, vulgar) A vagina.
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(informal, with "the") Solitary confinement, a high-security prison cell often used as punishment.
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(slang) An undesirable place to live or visit.
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(figurative) Difficulty, in particular, debt.
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(graph theory) A chordless cycle in a graph.
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(slang, rail transport) A passing loop; a siding provided for trains traveling in opposite directions on a single-track line to pass each other.
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(Canada, US, historical) A mountain valley.