Mme. Verdurin, seeing that Swann was within earshot, assumed that expression in which the two-fold desire to make the speaker be quiet and to preserve, oneself, an appearance of guilelessness in the eyes of the listener, is neutralised in an intense vacuity; in which the unflinching signs of intelligent complicity are overlaid by the smiles of innocence, an expression invariably adopted by anyone who has noticed a blunder, the enormity of which is thereby at once revealed if not to those who have made it, at any rate to him in whose hearing it ought not to have been made.