vs 

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"No sé" is a phrase which is often translated as "I don't know", and "dime tu" is a phrase which is often translated as "tell me your". Learn more about the difference between "no sé" and "dime tu" below.
no sé(
noh
 
seh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. I don't know
No sé si quiero pizza o un sándwich.I don't know if I want pizza or a sandwich.
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dime tu(
dee
-
meh
 
too
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(second person singular)
a. tell me your
Dime tu número de teléfono, y te llamo en cuanto sepa algo.Tell me your phone number, and I'll call you the moment I hear anything.
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