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él notarlo

to notice it, to write it down

→ notar
notar to notice, to observe + lo third-person singular masculine direct object
verb · third Rare #37,202
to notice it Direct object pronoun "lo" = "it" attached to the infinitive "notar".
SP: Voy a notarlo en cuanto llegue.
EN: I'm going to notice it as soon as it arrives.
to write it down In Spanish, "notar" can also mean "to write down" or "to take note of".
SP: No olvides notarlo en tu cuaderno.
EN: Don't forget to write it down in your notebook.
Conjugation of notar
notarnotarlo

Caminando rápido, nadie va a notarlo.

Walking quickly, nobody will notice.

Les gustaron ambos, puedo notarlo.

They liked both, I can tell.

— Pillion (2025)

El tipo de la parada tenía cabeza de vaca pero Bill fingió no notarlo.

The guy at the bus stop had a cow's head, but Bill pretended not to notice.

— It's Such a Beautiful Day (2012)

Un crítico fue el primero en notarlo.

A critic was the first to notice it.

— Sacrificio (1986)

Ella fue la primera en notarlo.

She was the first to notice it.

Ella pasó por el lado suyo sin notarlo.

She walked past him without noticing.

Te gustará, puedo notarlo.

You'll like it, I can tell.

— Blade Runner 2049 (2017)