single

Single \Sin"gle\, v. i. To take the irrregular gait called single-foot; -- said of a horse. See {Single-foot}. [1913 Webster] Many very fleet horses, when overdriven, adopt a disagreeable gait, which seems to be a cross between a pace and a trot, in which the two legs of one side are raised almost but not quite, simultaneously. Such horses are said to single, or to be single-footed. --W. S. Clark. [1913 Webster]