unable to think of something to say.

Chris was lost for words at Kathy's incredible rudeness.

Usage notes: usually said because something has surprised you

• man of the cloth
• man of the moment
• man of the world
• man of your dreams
• man on the Clapham omnibus
• man on the street
• man's best friend
• man's got to do what a man's got to do.
• man's man
• man-to-man
• many a
• many a someone
• many a something
• many moons ago
• map out
• map out something
• march to a different drummer
• mare's nest
• mark down
• mark down something
• marked man
• mark my words
• mark my words.
• mark time
• mark up