Plural of 'doer': people who actively accomplish things or take action, rather than just talking or thinking about them.
From Old English 'dōn' (to do) plus the agent suffix '-er' (one who does), then pluralized with '-s.' This straightforward formation has been in English for over a thousand years.
There's a fundamental human divide that language captures perfectly—we have 'doers' and everyone else, which tells you that taking action over mere planning is so culturally important we made it a personality category.
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