Douter
Je ne me doutais de rien = I did not suspect anything.
Je m’en doutais = I thought so.
Douzaine
C’est un poète comme on en trouve à la douzaine = He is a very minor poet.
[Régnier, Sat. iv.]
Dragée
Tenir la dragée haute à quelqu’un = To make a person pay well (or, wait a long time) for what he desires.
Dragon
Cette femme est un vrai dragon = 1. That woman is a virago. 2. That woman is very masculine (in appearance and manners).