means A seat fitted onto the back of a horse (or other animal) for a rider, and by extension the seat of a bicycle or a ridge of high land between two peaks.

from From Old English 'sadol,' a word shared across the Germanic languages — Old Norse 'soðull,' Old High German 'satal' — all pointing back to a Proto-Germanic 'sadulaz.' Some scholars trace it further to a Proto-Indo-European root '*sed-' meaning 'to sit,' which would tie it to the same ancient family as 'sit' and 'seat,' though that deeper link is reconstructed rather than recorded. The geographic 'saddle' — a dip between mountain peaks — and verbs like 'saddle someone with debt' are later, metaphorical extensions of the same picture: something you mount and bear.