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Phrase(s): 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?, Phrase(s): saddle up
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.
McGrawhill's American Idioms And Phrasal Verbs