Plural of 'er'; filler sounds people make when speaking hesitantly (like 'um' or 'uh'), or people who do something (suffix as in 'runners').
As a filler word, 'er' is an imitative/onomatopoetic word from hesitant speech. As a suffix, it comes from Old English and Germanic origins, meaning 'one who does' an action.
Linguists track 'ers' and 'ums' in speeches to measure nervousness or deception—more filler words usually means someone is uncomfortable, which is why TED speakers practice eliminating them!
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