sell (your) soul (to the devil)

to accept immoral behavior in order to succeed.

If the day comes when I begin to sell my soul like the other managers do, that's the day I'll quit.

Etymology: from the literal idea of exchanging your soul (= spirit) with the devil (= the origin of evil) to get something you want

• man of many parts
• man of means
• man of straw
• 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