资料来源 : pyDict

门钉

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Doornail \Door"nail`\, n.
   The nail or knob on which in ancient doors the knocker
   struck; -- hence the old saying, ``As dead as a doornail.''

资料来源 : WordNet®

doornail
     n : a nail with a large head; formerly used to decorate doors