A person who grins a lot or has a tendency to smile broadly and often.
From English 'grin' (to smile widely) plus the diminutive suffix '-ie' or '-y', likely emerging in informal English speech during the 20th century as a playful descriptor of someone's habitual expression.
This word captures how English speakers love creating quick personality descriptions by adding '-ie' to verbs—we do the same with 'talkie,' 'walker,' and 'runner.' It shows how flexible and creative language can be when we describe people!
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