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QUICK ANSWER
"Ay" is a form of "ay", an interjection which is often translated as "ow". "Lo siento" is a phrase which is often translated as "I'm sorry". Learn more about the difference between "lo siento" and "ay" below.
lo siento(
loh
syehn
-
toh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. I'm sorry
Me enteré del fallecimiento de tu padre. Lo siento.I heard about the death of your father. I'm sorry.
ay(
ay
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
b. jeez (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Ay! Me asustaste.Jeez! You scared me.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
