Plural of grinner; multiple people who grin or smile broadly.
From 'grinner' (grin + -er agent suffix) with the regular English plural '-s.' Each part builds on the previous one: grin → grinner → grinners.
The word shows the elegance of English word formation: we can stack suffixes to build complex meanings from simple roots—you can see the whole etymology just by looking at the shape of the word.
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