1‘his collaborator on the book’
co-worker, fellow worker, associate, colleague, partner, co-partner, confederate, ally, teammate
British informal oppo
2‘he was a collaborator during the occupation’
quisling, fraternizer, collaborationist, colluder, sympathizer, enemy sympathizer, conspirator
traitor, fifth columnist, renegade, betrayer, turncoat, defector, informer, double agent
We take a look at several popular, though confusing, punctuation marks.