The verb 'step' originates from the Old English 'steppan', a strong verb meaning to go, advance, or tread. Its Proto-Germanic root stap- carries the core sense of pressing the foot down. The modern regular past tense form 'stepped' utilizes the common Germanic weak verb suffix '-ed', which evolved from the Old English '-ode'. This suffixation pattern became the standard for forming the past tense of most English verbs, transforming the action 'step' into its completed form 'stepped'. The adjectival use, describing something shaped like steps, is a natural semantic extension from this verbal participle.

Structure: step (to move the foot) + ped (past tense suffix) 'step' is from Old English 'steppan', 'stæppan', meaning to tread, step. The suffix '-ed' is from Old English '-ode', '-ade', '-ed', used to form the past tense and past participle of regular verbs.