saddle

To put a saddle (noun sense 1) on (an animal).

To put (something) on to another thing like a saddle on an animal.

(figuratively); (woodworking) To cut a saddle-shaped notch in (a log or other piece of wood) so it can fit together with other such logs or pieces; also, to fit (logs or other pieces of wood) together with this method.

(obsolete); To put a saddle on an animal.

Of a person: to get into a saddle.