1
general::
Phrase(s): come what may
Cliché no matter what might happen. • I’ll be home for the holidays, come what may. • Come what may, the mail will get delivered.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
No matter what happens, as in Come what may, I'll be home in time for dinner. This phrase, in slightly different form, come what will, dates from the 16th century and has almost exact equivalents in French, Italian, and German.
American Heritage Idioms