look up any word, like bangarang:
 
1.
to downgrade the intelligent-ness of something,
in order for it to be more comprehendable;
particularly refers to statements.
"My antibodies will last me a lifetime! Die foreign microorganisms!" 8)
"Dumb it down dude, I don't even know what you're talking about."

Lupe Fiasco's "Dumb It Down" song.
by d[x_x]b September 30, 2007
 
2.
Convert a file from a current version of a program to a previous version of the same program.
User 01: I can't open this file.
User 02: No wonder why. It's in Word 2003, email it to me and I'll dumb it down to Word 2000 and send it back to you.
by slavens (slave-ens) February 28, 2006