no se haga el

don't pretend to be

→ no
phrase Rare #35,349
don't pretend to be Used with a noun or adjective to tell someone not to act like or pretend to be something, often in an annoyed or admonishing tone. The form haga is the formal usted command; for tú, use no te hagas el.
SP: No se haga el sorprendido; usted ya lo sabía.
EN: Don't pretend to be surprised; you already knew.

Que no se haga el listo.

Don't try to be clever.

— Quieto, muere, resucita (1990)

No se haga el listillo.

Don't get smart.

— Oppenheimer (2023)

No se haga el pelotudo.

Don't play dumb.

— El secreto de sus ojos (2009)

No se haga el idiota.

Don't play dumb.

— Los chicos del coro (2004)

No se haga el listo.

Don't act smart.

— Núremberg (2025)

No se haga el enfermo conmigo, Sr. Morton.

Don't pretend to be sick with me, Mr. Morton.

— Hasta que llegó su hora (1968)

No se haga el tonto.

Don't play dumb.

— La princesa prometida (1987)