We found one dictionary that defines the word knee high to a jackrabbit:

Miscellaneous (1 matching dictionary)

1. knee-high to a jackrabbit: Idioms

▸ Words similar to knee high to a jackrabbit ▸ Usage examples for knee high to a jackrabbit ▸ Idioms related to knee high to a jackrabbit ▸ Wikipedia articles (New!) ▸ Words that often appear near knee high to a jackrabbit ▸ Rhymes of knee high to a jackrabbit ▸ Invented words related to knee high to a jackrabbit