Horseplay

Flump - an abrupt or heavy fall
Send for a horse ladder - send on a fool's errand
Horse's meal - food served without drink
Who put that monkey on horseback without tying his tail? - said of a very bad horseman
Ride the forehorse - to be early
Saddle the wrong horse - lay blame on the wrong person
Saddle one's nose - wear spectacles
Go a snail's gallop - move very slowly
Scarlet horse - a hired horse