Martel
Il s’est mis martel en tête = He made himself very uneasy.
Massacrer
Il est d’une humeur massacrante = He is as cross as two sticks.
Matière
Il est bien enfoncé dans la matière = He is very coarse, very prosaic.
La table des matières = The table of contents (of a book).
Matin
Il partira un de ces quatre matins = He will start one of these fine days.