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no se lo diré a nadie

I won't tell anyone

→ no
phrase Rare #37,164
I won't tell anyone Uses a double object pronoun: lo = it, se = to him/her/you/them. Often used to reassure someone that a secret will stay private.
SP: No te preocupes, no se lo diré a nadie.
EN: Don't worry, I won't tell anyone.

Pero no se lo diré a nadie, especialmente no a Ud.

But I won't tell anyone, especially not you.

— La vida es bella (1997)

No se lo diré a nadie más.

I won't tell anyone else.

No seas tonto, yo no se lo diré a nadie.

Don't be silly, I won't tell anyone.

— El regreso (2003)

Te prometo que no se lo diré a nadie.

I promise I won't tell anyone.

Pase lo que pase no se lo diré a nadie.

No matter what happens, I won't tell anyone.

Prometo que no se lo diré a nadie.

I promise I won't tell anyone.

No se lo diré a nadie.

I won't tell anyone.

— Deseando amar (2000)