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1. To fit a saddle onto an animal, especially a horse, in order to ride it. In this usage, a noun or pronoun can be used between "saddle" and "up." Norm, go saddle up the horses for our guests, please. We finished saddling the mules up and got ready for our descent into the Grand Canyon.
2. To sit in an animal's saddle in order to ride it. There's a storm coming—we'd better saddle up and head back to the ranch.
saddle an animal up
to put a saddle on a horse or some other beast of burden. Please saddle my horse up. I have to leave. Would you saddle up my horse for me?
1. Lit. to prepare one's horse for riding by putting a saddle on it. Let's saddle up and go for a ride.
2. Fig. to mount one's horse and sit in the saddle. The cowboys saddled up and took off after the rustlers.
1. To put a saddle on a horse: The cowboys saddled up and rode off.
2. To put a saddle on some animal: The cowboy saddled up three horses for the other riders. Some camels don't like it if you saddle them up at night.