(intransitive, racing) To finish third, especially of horses or dogs.
(obsolete) To have a certain appearance, such as well or ill, fit or unfit; to become or suit; to appear.
Usage notes
The past participle shown was uncommon before the 19th century, but is now the preferred form in standard English. In the UK, showed is regarded as archaic or dialectal. In the US, it is considered a standard variant form, but shown is more common. Garner's Modern American Usage favors shown over showed as past participle and claims it is mandatory for passives.
In the past, shew was used as a past-tense form and shewed as a past participle of this verb; both forms are now archaic.