How big is a Collins Gem french dictionary?
Collins Gem dictionary are pocket sized, so you need to go for something else. I use Larousse dictionaries, but also Cambridge Word Routes (excellent) and anything by Harraps or Hachette. For my own amusement, I use a slang dictionary, which obviously is updated yearly. Good website to use is www.grantandcutler.co.uk or use amazon.fr Bonne chance!