A horse can jump, I know of a bucking horse, but what does a horse do when in fear or protest moves its entire body in an upward position and stands on its two rear legs?
Thanks in advance
It rears (raises its front legs), or it shies (tosses its head). This sort of 'shy' is not used in any other context. In fact, sometimes people unknowingly rewrite 'Jimmy Crack Corn' (as here: Blue Tail Fly - Wikipedia, the free encyclopedia ) to replace it with the rather banal 'the pony being very shy' instead of 'the pony being apt to shy'. Come to think of it, the 'apt to shy' version may be the arriviste - it's just the version I heard first.
In show jumping, a horse that does this and stops before jumping a fence is said to 'refuse'. It's intransitive: Her horse jumped all the fences until the last. Then it refused.
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From wikipedia -
Rearing is when a horse"stands up" on his hind legs, so that his body becomes more perpendicular to the ground. Rearing is considered a dangerous habit for riding horses, as it is possible for the animal to fall backwards, especially when carrying the added weight of a person, and possibly injure himself and crush his rider.
Shying is a description for the horse unexpectedly, suddenly and violently jumping one way or the other and is caused by the horse exhibiting fear of something that it has seen come into it’s surroundings.