Other members of Whig-Clio have included aaron burr, Woodrow Wilson, Samuel Alito, and Mitch Daniels.
aaron burr and Richard Cheney (Spiro Agnew's peccadilloes are miniscule in comparison), some two centuries apart.
And Turn looks and feels like some sort of soft-focus dramatic-reenactment segment from a PBS documentary about aaron burr.
"rough sound of the letter -r-" (especially that common in Northumberland), 1760, later extended to "northern accented speech" in general. Possibly the sound of the word is imitative of the speech peculiarity itself, or it was adapted from one of the senses of bur (q.v.), perhaps from the phrase to have a bur in (one's) throat (late 14c.), which was a figure of speech for "feel a choking sensation, huskiness." OED says the Scottish -r- is a lingual trill, not a true burr.
Variant of bur.