verb (used with object)
to fish (an area) excessively; to exhaust the supply of usable fish in (certain waters): Scientists are concerned that fishing boats may overfish our coastal waters.
verb (used without object)
to fish so as to deplete the supply of fish in certain waters: If the trawlers are going to overfish here, we'll need legislation to restrict their hauls.

1865–70; over- + fish

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Narrative, description and quotation illustrate a universal tendency to overfish and destroy.
These catch shares eliminate the incentive to overfish.
Shareholders who consistently overfish or misreport their catches must suffer the revocation of their quotas.
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