Séance tenante = Forthwith; There and then.

Sec

C’est un grand sec = He is a tall, spare man.

Sec comme un pendu = As thin as a lath.

Boire sec = To drink hard.

Il est à sec (pop.) = He is hard up, broke, in low water.

Sécher

Sécher sur pied = To pine away.

Secours