Really, don’t call anything a cumbrack, because that sounds disgusting.
But folks: newsflash!
As far as 1934 is concerned, “cucumber” and “[en]cumber” have nothing whatever to do with each other. So improbable-feeling, but there you go.
Also surprising: “cumberbund”* is NOT listed! “Bund” is “waistband” in German; I think we can all agree that “embarrassed waistband” is about right.
Also, a new term for the vexing:
So, Benedict Cumberbatch sometimes plays blackhearted cumberworlds. Bless him! Bless us all.