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"By the way" is a phrase which is often translated as "a propósito", and "BTW" is an abbreviation which is often translated as "por cierto". Learn more about the difference between "by the way" and "BTW" below.
by the way(
bay
 
thuh
 
wey
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. a propósito
By the way, do you have any plans for this evening?A propósito, ¿tienes planes para esta noche?
b. por cierto
I have to leave at noon, by the way.Me tengo que ir a mediodía, por cierto.
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An abbreviation is the shortened form of a word or group of words (e.g., "UFO" = "unidentified flying object"; "p." = "page").
abbreviation
a. por cierto
BTW, I'm going to be a few minutes late.Por cierto, voy a llegar unos minutos tarde.
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