A person who walks, or a device with wheels and a handle that helps elderly or disabled people move around safely.
From Old English 'wealcian' meaning to walk or roll, with Germanic roots. The modern sense of a mobility device developed in the 20th century.
Walker went from describing how you move to describing a tool that helps you move—language evolves when old words get new jobs! It's also a surname for people who traveled as merchants or messengers.
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