Ils sont comme les deux doigts de la main = They are hand and glove together, inseparable.
Vous avez mis le doigt dessus = You have hit the right nail on the head; You have touched the spot.
Mon petit doigt me l’a dit = A little bird told me so.
Il était à deux doigts de la mort = He was at death’s door, within an ace of death.
Se fourrer le doigt dans l’œil jusqu’au coude (pop.) = To deceive oneself most blindly; To put one’s foot in it.
Savoir sur le bout du doigt = To know perfectly; To have at one’s finger-ends.
Il lui obéit au doigt et à l’œil = He is at his beck and call.
Un doigt de vin (fam.) = A toothful of wine.
Dommage
C’est dommage! = What a pity.