“Bands of uniformed men marching through the streets and clashing with each other in brutally physical encounters became a commonplace sight in the Republic.”
“This is supposed to be different from the commonplace saying that their conduct was unethical but good nonetheless came of it, which no one would deny.”
“Moral speculation has been so long and so deeply permeated by the thought expressed in these treatises that it now appears trite and commonplace.”
commonplaced
simple past tense and past participle of commonplace