m/

Most probably adapted from German m/, abbreviating mit (“with”), rather than the other way around.

m/

1. abbreviation of med (“with”)

m/ [with dative]

1. (rare) abbreviation of mit (“with”)
   • 1931, Fritz Lang and Thea von Harbour (writers), Fritz Lang (director), M, Nero-Film AG, chapter 8 ("Die Organisation der Bettler")

     m/ Marmelade ― w/ jam

Adapted from Danish m/, abbreviating med (“with”), and/or from its probable source, German m/, abbreviating mit (“with”).

m/

1. abbreviation of með (“with”)

• v/
• f/