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(21,506 posts)And I could be wrong but I am pretty sure it is dumb as a doorknob not door nail. I am pretty sure it is dead as a door nail.
http://www.dictionary.com/browse/doornail
Doornail
Spell Syllables
Examples Word Origin
noun
1.
a large-headed nail formerly used for strengthening or ornamenting doors.
Idioms
2.
dead as a doornail, stone-dead:
After midnight, the town is dead as a doornail.
https://en.wiktionary.org/wiki/dead_as_a_doornail
One plausible explanation is that doors were built using only wood boards and hand-forged nails: the nails were long enough to dead nail the (vertical) wooden panels and (horizontal) stretcher boards securely together, so they would not easily pull apart. This was done by pounding the protruding point of the nail over and down into the wood. A nail that was bent in this fashion (and thus not easily pulled out) was said to be "dead", thus dead as a doornail.
That said you got the trump part exactly right
Le Gaucher
(1,547 posts)Need to fix the picture
Bernardo de La Paz
(60,320 posts)(body of post moot now)
