n. a coward; a person who is frightened of everything. (Used in children's taunts.) : Don't be a fraidy cat. Go ahead, jump!
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
fraidy-cat
"coward," c.1910 slang, from child's pronunciation of afraid + cat (q.v.).