Fromdown- +‎come.

downcome (pluraldowncomes)

1. Atumbling orfalling down; a sudden or heavy fall; anoverthrow;ruin;destruction.
   • 1641 May,John Milton,Of Reformation Touching Church-Discipline in England: And the Cavvses that hitherto have Hindred it; republished as Will Taliaferro Hale, editor,Of Reformation Touching Church-Discipline in England (Yale Studies in English; LIV), New Haven, Conn.:Yale University Press,1916,→OCLC, 1st book,pages9-10:

     And doutles, when ever thePope shall fall, if his ruine bee not like the suddendown-come of a Towre, theBishops, when they see him tottering, will leave him, and fall to scrambling[…]

2. Inironmaking, apipe that leadscombustiblegasesdownward from the top of theblast furnace to the hot-blast stoves, boilers, etc., where they are burned.
3. Adownpour ofrain.

downcome (third-person singular simple presentdowncomes,present participledowncoming,simple pastdowncame,past participledowncome)

1. To come down; fall down; come or fall apart.
   • 1958,Botteghe Oscure - Issue 21, page174:

     Mirage-bound and moving blind, hedowncomes, Up-growing from his sapling game In the laughing park, Bearing the stolen spark

   • 1995, Jack Womack,Random Acts of Senseless Violence - Page 242:

     Everthingdowncame today Anne the world's spinning out and I spec we finally all going to be riding raw.

   • 2013, Jack Womack,Random Acts of Senseless Violence,→ISBN:

     If she exes I don't know what woulddowncome.

• come down,come-down,comedown