Bank employees who handle customers' transactions like deposits and withdrawals, or people who tell stories.
From 'tell' (to narrate or say) + '-er' (one who does). It originally meant storytellers, then was applied to bank employees in the 1800s as banks formalized their roles.
The same word means both 'bank workers' and 'storytellers'—that's because 'telling' is the core action, whether you're telling a story or telling (counting and recording) money! This shows how one action can have many contexts.
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