Etymology
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cob (n.)

a word or set of identical words with a wide range of meanings, many seeming to derive from notions of "heap, lump, rounded object," also "head," and metaphoric extensions of both. With its cognates in other Germanic languages, of uncertain origin and development.

"The N.E.D. recognizes eight nouns cob, with numerous sub-groups. Like other monosyllables common in the dial[ect] its hist[ory] is inextricable" [Weekley]. In the 2nd print edition, the number stands at 11. Some senses are probably from Old English copp "top, head," others probably from Old Norse kubbi or Low German, all the words perhaps trace to a Proto-Germanic base *kubb- "something rounded."

Among the earliest attested English senses are "headman, chief," and "male swan," both early 15c., but the surname Cobb (1066) suggests Old English used a form of the word as a nickname for "big, leading man." The "corn shoot" sense is attested by 1680s.

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Definitions of cob

cob (n.)
nut of any of several trees of the genus Corylus;
Synonyms: hazelnut / filbert / cobnut
cob (n.)
stocky short-legged harness horse;
cob (n.)
white gull having a black back and wings;
Synonyms: black-backed gull / great black-backed gull / Larus marinus
cob (n.)
adult male swan;
From wordnet.princeton.edu