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Any of several families of beetles that are primarily found on or near the ground. Milly screamed and ran across the back yard after she overturned a stone and disrupted a group of ground beetles.
A stupid person. Did you hear that guy's ridiculous question? Geez, what a beetlebrain.
n. the original Volkswagen automobile. I remember when people used to put big windup keys on their beetles to make them look like windup toys.
n. a stupid person. Why are you such a beetlebrain when it comes to math?
blind as a bat/beetle/mole
Totally blind, or, figuratively, unseeing. None of these animals is, by the way, truly blind. The bat flies about in the dark in seemingly erratic paths (see bats in one’s belfry), and the beetle and mole burrow through the ground. Nevertheless, these similes are quite old and have become clichés. The bat analogy dates from the sixteenth century at least (John Harvey); the mole and beetle similes come from Roman times and were cited in translations by Erasmus.