pantomime horsen. a comic stage horse played by two actors inside a single costume, one acting as the front end of the horse and the other as the back.
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1927 Times 29 Dec. 7/3 One hundred and eighty children welcomed the appearance of a pantomime horse.
1999 Mixmag Apr. 92/1 Andy Fenner dressed up as a pantomime horse and galloped around while a Nice helper-outer rode astride, handing out fruit.