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Any one of numerous large marine mammals comprising an informal group within infraorder Cetacea that usually excludes dolphins and porpoises.
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(by extension) Any species of Cetacea.
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(figuratively) Something, or someone, that is very large.
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(figuratively, as "whale of a ___") Something, or someone, that is excellent.
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(gambling, figuratively) A gambler who routinely wagers large amounts of money.
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(finance, figuratively, informal) An investor who deals with very large amounts of money.
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(marketing, figuratively) A person who spends large amounts of money on things that are marketed to them.
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(figuratively, colloquial, derogatory) An overweight person (usually a woman)