Is the word milled an action of a horse?

Yes, "milled" is an action of a horse, but it's not a common term used for a horse's action. It usually refers to a horse *circling* or *walking in a small circle*, often with its head down, as if it's grinding something.

Here are some possible scenarios where a horse might be described as "milling":

* Nervousness or boredom: A horse might mill around in its stall if it's bored or anxious.

* Seeking something: A horse might mill around in a field, looking for something to eat or a place to roll.

* A specific training technique: A trainer might ask a horse to "mill" around an obstacle as part of a training exercise.

It's important to note: While "milled" is not a common term to describe a horse's action, it's a perfectly valid word to use in these specific contexts.