rabbit's foot

or rabbit foot, rabbit-foot

See synonyms for rabbit's foot on Thesaurus.com
noun
  1. the foot of a rabbit, especially the left hind foot carried as a good-luck charm.

Origin of rabbit's foot

1
An Americanism dating back to 1810–20

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024