crippler

noun3

1. •
   A person who, or thing which cripples.
2. •
   A sighting of an extraordinarily rare bird, such that it almost has an paralysing effect on the birder.

   • Blue-headed Wagtails and migrant Warblers were nice but hardly ‘cripplers’. — 1983
3. •
   A corrugated board used to grain leather.