Coward

n. One who in a perilous emergency thinks with his legs.

adj. and sb. cowardly, a cowardEtymology: Anglo-French coward, cuard, cp. the heraldic term lion couard, a lion with his tail between his legs, and the name for the hare in the old terms of hunting ‘la cowarde ou la court cowe ,' i.e. short-tail.Formed with the suffix -ard from Old French coe, tail; Latin cauda. Italian codardo, from coda, a tail.