Décoiffer
*Décoiffer (Découvrir) St. Pierre pour coiffer St. Paul = To rob Peter to pay Paul.
Découvrir
On a découvert le pot aux roses = They have discovered the mystery, the secret.
Être à découvert = To be unprotected, undisguised.
Décrocher
Un décrochez-moi-ça (pop.) = A reach-me-down (second-hand garment).
Dedans
Elle est tout en dedans = She is not communicative.
On l’a mis dedans (fam.) = 1. They took him in (i.e. they deceived him). 2. They ran him in (i.e. they put him in prison).