What does the Latin 'murum et virorum' mean?

The English equivalent of the Latin phrase 'murum et virorum' is the following: of mice and men. The word-by-word translation is as follows: 'murum' means 'of mice'; 'et' means 'and'; 'virorum' means 'of men'. The pronunciation is the following: MOO-ruhm eht vih-ROH-ruhm. The English phrasing is used in the title of a book by American author John Ernst Steinbeck III [February 27, 1902-December 20, 1968]. Steinbeck himself borrowed the title from the poem, 'To a Mouse', by Robert Burns [January 25, 1759-July 21, 1796], The Bard of Scotland: 'The best laid schemes of mice and men gang aft agley*. *often go wrong.