finish third or better in a horse or dog race(verb.competition)
Example: He bet $2 on number six to show.
source: wordnet30
To exhibit or present to view; to place in sight; to display; -- the thing exhibited being the object, and often with an indirect object denoting the person or thing seeing or beholding; as, to show a house; show your colors; shopkeepers show customers goods (show goods to customers).(verb)
source: webster1913
To exhibit or manifest one's self or itself; to appear; to look; to be in appearance; to seem.(verb)