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mantenerla

keep her, keep it

m a n t e ˈn e ɾ l a → mantener
mantener to keep, to maintain + la her/it (feminine object pronoun)
verb · singular Rare #43,920
keep her, keep it "-la" is a direct object pronoun meaning "her" or "it" (feminine noun).
SP: Necesito mantenerla limpia.
EN: I need to keep it clean.
Conjugation of mantener

Tienes que mantenerla.

You have to keep her.

— Campo de sueños (1989)

Si supiera lo difícil que es mantenerla en su lugar.

If you knew how hard it is to keep it in its place.

— El cartero (y Pablo Neruda) (1994)

Ahora casi no podemos mantenerla.

We can barely support her now.

— El médico de Budapest (2020)

Una vez que hayas hecho una promesa, debes mantenerla.

Once you've made a promise, you must keep it.

Toda esa oscuridad, no puedes mantenerla alejada.

All that darkness, you can't keep it away.

— Return to Silent Hill (2026)

Sounds similar to

mantenerlo m a n t e ˈn e ɾ l o