The antonyms for "climbed upon" are words that describe movements that are essentially the opposite of climbing. These antonyms include words such as "descend," "descended from," "alight," "disembark," "dismount," and "step down." Each of these words signifies a different way of moving downwards without having to climb up. While climbing signifies an upward movement, descending is a downwards movement. Alighting, disembarking, and dismounting signify getting down from a vehicle or an elevated platform while stepping down means getting down from a step or a platform. Therefore, these antonyms are essential for describing movements that require getting down from an elevated platform or object.