unconscious good sense working progressively to desynonymize those words originally of the same meaning

The unusual Jewish custom of the shvartze chaseneh or “black wedding” goes back to the shtetls (small towns) of Eastern Europe in the days when cholera and other diseases were epidemic in humid summers.

Fresh vegetables are a good source of fibre.

Among current novelists, Martin Amis lacks intellectual force but is well supplied with nastiness, which occasionally resembles humor.