How to Say "grin" in Spanish
The Spanish word for “grin” is “sonrisa” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
nounA1
a wide, often broad smile

Examples
Su sonrisa iluminó toda la habitación.
Her smile lit up the whole room.
Siempre me da una gran sonrisa cuando me ve.
She always gives me a big smile when she sees me.
Vi una sonrisa pícara en su rostro.
I saw a mischievous smile on his face.
Gender Reminder
Even though it ends in '-a', 'sonrisa' is a feminine noun, so you must use feminine articles and adjectives with it (e.g., 'la sonrisa', 'una sonrisa').
Confusing Noun and Verb
Mistake: “Using *sonreír* (the verb 'to smile') when you need the noun: 'Ella tiene un *sonreír* bonito.'”
Correction: Use the noun: 'Ella tiene una *sonrisa* bonita.' (She has a beautiful smile.)
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