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knee-high to a jackrabbit

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*knee-high to a jackrabbit

 and *knee-high to a grasshopper

Rur. very small or short. (Usually used to describe children. *Typically: be ~; since someone was ~.) I've known you since you were knee-high to a jackrabbit. My, how you've grown! The last time I saw you, you were knee-high to a grasshopper!