 In Standard American a reverse is defined by William S. Root as "... a nonjump bid at the two-level in a new suit "that ranks higher than the suit you bid first"", and by Bridge World.as "a non-jump bid in a new suit that bypasses a bid in a lower-ranking suit already bid by the same player".The Acol definition is somewhat wider and includes "any bid of a new suit by opener higher than two of their first suit".