n. a bit; a small bit. : That's a little more than a tad, but it's all right.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
tad
1877, "young or small child," probably a shortened form of tadpole. The extended meaning "small amount" is first recorded 1915.