when the jockey had a cold at the kentucky derby everyone said that he was a little hourse

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http://www.dictionary.com/browse/hoarse?s=t

The saying "a little horse" is a play on words, using a pun. It's a humorous way of saying that someone has a hoarse voice, which means their voice sounds rough and strained.

To understand the humor behind this saying, you need to know a couple of things. First, jockeys are the riders of horses in horse racing. Second, the Kentucky Derby is a famous horse race that takes place annually in the United States.

Now, let's break down the saying and explain it in steps:

1. The jockey had a cold: In this situation, the jockey, who normally has a clear voice, has a cold. When you have a cold, you often experience a hoarse voice due to inflammation of the vocal cords.

2. "A little horse": This is a play on words. Instead of saying "hoarse," which means having a rough voice, the saying replaces "hoarse" with "horse." It's a clever wordplay that connects the jockey's occupation (racing horses) with his temporary hoarse voice.

3. Everyone said: The saying became a playful joke or rumor among the people who were aware of the jockey's cold. It was probably shared among the horse racing community, spectators, or fans who had noticed the change in the jockey's voice.

In summary, when people said that the jockey was "a little horse" at the Kentucky Derby, they were making a humorous pun based on the jockey's temporary hoarse voice caused by a cold.