From Longman Dictionary of Contemporary Englishgrasshoppergrass‧hop‧per /ˈɡrɑːsˌhɒpə $ ˈɡræsˌhɑːpər/ noun [countable] 
HBIan insect that has long back legs for jumping and that makes short loud noises → knee-high to a grasshopper at knee-high(2)
HBIan insect that has long back legs for jumping and that makes short loud noises → knee-high to a grasshopper at knee-high(2)Examples from the Corpus
grasshopper• To drive, the MR2 feels like a grasshopper.• Even when she was knee-high to a grasshopper.• A grasshopper is big to a ladybug.• Black cap, white throat and grasshopper warbler had been sighted.• We had a drought, grasshoppers, crickets.• Their food consists of virtually any invertebrate small enough to swallow, including grasshoppers, spiders and caterpillars.• In the ensuing years the county was ravaged by plagues of grasshoppers.• The children sat in their corner of the back room and grumbled over their grasshoppers. 