tv. to look hard at someone or something. : The two eyeballed each other and walked on.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: eye·ball Pronunciation: 'I-"bol Function: noun : the more or less globular capsule of the vertebrate eye formed by the sclera and corneatogether with their contained structures