saddle

• sad‧dle [countable]
• 1 a leather seat that you sit on when you ride a horse
• 2 a seat on a bicycle or amotorcycle
• 3

   in the saddle

  informal
• a) riding a horse:
• We did six or eight hours in the saddle every day.
• b) in a position in which you have power or authority:
• He always has to be in the saddle, controlling everything.
• 4

   saddle of lamb/hare/venison

  a large joint of meat taken from the middle of the animal's back
• 

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.