A person or thing that backtracks, retraces steps, or reverses direction.
From 'backtrack' + '-er' (Old English suffix forming agent nouns). A straightforward agent noun formation.
The word 'backtracker' isn't commonly used today, which tells us something interesting—we prefer to describe actions ('they backtracked') rather than label people by single behaviors, a shift that reflects modern psychology's understanding of identity.
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