Definition of "sidelock"

observation of the Sabbath (rather than the décadi) and the wearing of Jewish side-locks and beards were regarded as ‘uncivic’ offences.

2002, Colin Jones, The Great Nation, Penguin, published 2003, page 558

Its male residents dress like crows: heavy black suits, black Borsalino hats, the old grandfathers hugely whiskered and the boys in peot, the curled sidelocks of the pious.

2014 December, Paul Salopek, “Blessed. Cursed. Claimed.”, in National Geographic‎, archived from the original on 12 February 2015