different between gadfly vs botts

English

From gad (“spike”) +? fly.

gadfly (plural gadflies)

Any dipterous insect of the family Oestridae, commonly known as botflies.
Synonyms: botfly, warble fly
A horsefly: any of various species of fly, of the family Tabanidae, noted for buzzing about animals and sucking their blood.
Synonyms: horsefly, stoat-fly, stout
- 2005, Rafael Argullol, The End of the World as a Work of Art: A Western Story, Bucknell University Press (?ISBN), page 48:
  Vengeful Hera transformed her into an animal (a beautiful cow), and imposed upon her the company of a gadfly to sting her continuously, thus forcing her to escape on an endless pilgrimage.
(figuratively) One who upsets the status quo by posing upsetting or novel questions, or attempts to stimulate innovation by proving an irritant.
Synonyms: see Thesaurus:maverick
(derogatory) One who merely irritates without making useful suggestions.
(derogatory, slang) A bloodsucker; a person who takes without giving back.
Synonyms: bloodsucker; see also Thesaurus:scrounger

Possibly a modification of Scottish Gaelic boiteag 'maggot'

botts (uncountable)

The disease caused by the maggots of the horse bot fly when they infect the stomach of a horse.
(by extension) Infection by maggots under the skin of cows, or by sheep maggots in the frontal sinus of sheep.

The noun is usually used in the plural with the definite article. ("The botts")

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