no le cuentes a

don't tell

→ no
phrase Rare #26,533
don't tell Used to tell someone not to tell something to a particular person. The person being told is introduced with “a”: “No le cuentes a Tom...” means “Don’t tell Tom...”. “Le” refers to the person receiving the information.
SP: No le cuentes a nadie lo que pasó.
EN: Don't tell anyone what happened.

No le cuentes a nadie sobre esto.

Don't tell anyone about this.

No le cuentes a Tom lo que hemos hecho hoy.

Don't tell Tom what we've done today.

No le cuentes a Tom que Mary no está pensando en ayudar a su madre.

Don't tell Tom that Mary isn't thinking about helping her mother.

Espero que no le cuentes a nadie que te lo he dado.

I hope you don't tell anyone I gave it to you.

— State and Main (2000)

No le cuentes a tu madre lo que has visto aquí.

Don't tell your mother what you've seen here.

No le cuentes a Tom lo que planeamos hacer el próximo fin de semana.

Don’t tell Tom what we’re planning to do next weekend.

Mira, no le cuentes a mami, ¿?

Look, don't tell Mommy, okay?

— Drive (2011)