Definition of knee-high to a grasshopperinformal
- I haven't seen you since you were knee-high to a grasshopper.
: rising or reaching upward to the knees
: any of numerous plant-eating orthopterous insects (Acrididae, Tettigoniidae, and some related families) having the hind legs adapted for leaping and sometimes engaging in migratory flights in which whole regions may be stripped of vegetation
: a cocktail made with crème de menthe, crème de cacao, and light cream
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