noun
a very large marine mammal with a streamlined body and a horizontal tail fin, breathing air through blowhole(s) on the top of its head
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The whale population has been steadily decreasing due to overfishing and pollution.
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I heard there was a whale sighting off the coast yesterday!
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That party was a whale of a time!
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She felt like a small fish in a big pond, surrounded by whale-sized competitors.