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Phrase(s): *knee-high by the 4th of July
Fig. grown as tall as it should. (Corn seedlings are proverbially supposed to be as high as someone’s knee by July 4th.) (*Typically: be ~; become ~; grow ~.) • What with this drought, I don’t think the crop will be knee-high by the 4th of July. • It’s gonna be a good year. Knee-high by the 4th of July.
McGrawhill's American Idioms And Phrasal Verbs