Etymology
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beetle (n.1)

insect of the order Coleoptera, Old English bitela "beetle," apparently originally meaning "little biter, biting insect," from bitel "biting," from Proto-Germanic *bitan, from PIE root *bheid- "to split," with derivatives in Germanic referring to biting.

By normal evolution it would be *bittle, but it seems to have been influenced by beetle (n.2). Sometimes applied to soft insects, as black beetle, an old name for the cockroach. As a nickname for the original Volkswagen car, 1946, translating German Käfer.

beetle (v.)

"project, overhang," apparently a Shakespearean back-formation (in "Hamlet," 1602) from bitelbrouwed "grim-browed, sullen" (mid-14c.), from bitel "sharp-edged, sharp" (c. 1200), probably a compound from Old English *bitol "biting, sharp" (related to bite (v.)), + brow, which in Middle English meant "eyebrow," not "forehead." Meaning "to overhang dangerously" (of cliffs, etc.) is from c. 1600. Related: Beetled; beetling.

beetle (n.2)

"heavy wooden mallet used to drive wedges, pack earth, etc.," Old English bietl "mallet, hammer," from Proto-Germanic *bautilo-z, from *bautan "to beat," from PIE root *bhau- "to strike."

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Definitions of beetle
1
beetle (v.)
be suspended over or hang over;
This huge rock beetles over the edge of the town
Synonyms: overhang
beetle (v.)
fly or go in a manner resembling a beetle;
He beetled up the staircase
They beetled off home
beetle (v.)
beat with a beetle;
2
beetle (n.)
insect having biting mouthparts and front wings modified to form horny covers overlying the membranous rear wings;
beetle (n.)
a tool resembling a hammer but with a large head (usually wooden); used to drive wedges or ram down paving stones or for crushing or beating or flattening or smoothing;
Synonyms: mallet
3
beetle (adj.)
jutting or overhanging;
beetle brows
Synonyms: beetling
From wordnet.princeton.edu