Wiktionary
alt. (context chiefly US English) A charm carried to bring good luck, traditionally consisting of the left rear foot of a rabbit. n. (context chiefly US English) A charm carried to bring good luck, traditionally consisting of the left rear foot of a rabbit.
Wikipedia
In some cultures, the foot of a rabbit is carried as an amulet believed to bring good luck. This belief is held by individuals in a great number of places around the world, including Europe, China, Africa, and North and South America. It is likely that this belief has existed in Europe since 600 BCE amongst Celtic people. In variations of this superstition, the donor rabbit must possess certain attributes, have been killed in a particular place, killed by a particular method, or by a person possessing particular attributes (e.g., by a cross-eyed man).
Usage examples of "rabbit's foot".
Harper said, then crossed himself before reaching into his pocket to make sure his rabbit's foot was in its proper place.
How many still carried a secret rabbit's foot, or if not a rabbit's foot, a certain lucky piece, a coin, perhaps, or some silly little emblem?
I pulled the cobweb between the purse and an Edwardian rabbit's foot and tucked it behind the totem.
A lucky rabbit's foot, a bullet that had nearly killed them, a memento of home, or just a plain pebble that had caught their eye as they lay under heavy fire on a battlefield.
PROSPECT frequented the Sultan's Room 8e the Rabbit's Foot Club, drank habitually & habitually used amphetamines.
Hazel peered closely into the thick, coarse hair (a rabbit's foot has no pads) and after a few moments saw what he had expected--the oval shank of a snapped-off thorn sticking out through the skin.