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QUICK ANSWER
"Yo digo" is a form of "yo digo", a phrase which is often translated as "I say". "Tú dices" is a form of "tú dices", a phrase which is often translated as "you say". Learn more about the difference between "yo digo" and "tú dices" below.
tú dices(
too
dee
-
sehs
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (informal) (singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. you say
Haré lo que tú dices si me prometes que no hay otra alternativa.I'll do what you say if you promise me there's no alternative.
b. you're saying
Si lo que tú dices es cierto, entonces tendremos que trabajar más duro.If what you're saying is true, then we'll have to work harder.