To show the white feather

Also found in: Idioms.
Related to To show the white feather: Order of the White Feather
to betray cowardice, - a white feather in the tail of a cock being considered an indication that he is not of the true game breed.

See also: Feather

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.