Saddle

a seat for the rider of a horse or other animal

a pass or ridge that slopes gently between two peaks (is shaped like a saddle)

cut of meat (especially mutton or lamb) consisting of part of the backbone and both loins

a piece of leather across the instep of a shoe

a seat for the rider of a bicycle

posterior part of the back of a domestic fowl

put a saddle on

load or burden

impose a task upon, assign a responsibility to