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(countable) The part of the body of an animal or human which contains the brain, mouth, and main sense organs.
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(countable) The topmost, foremost, or leading part.
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(social, countable, metonymic) A leader or expert.
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A significant or important part.
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Headway; progress.
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Topic; subject.
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(only in the singular) Denouement; crisis.
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(fluid dynamics) Pressure and energy.
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(slang, vulgar, uncountable) Fellatio or cunnilingus; oral sex.
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(slang) The glans penis.
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(slang, countable) A heavy or habitual user of illicit drugs.
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(obsolete) Power; armed force.