How to Say "on guard" in Spanish
The Spanish word for “on guard” is “alerta” — B1 level. This is a very common word in everyday Spanish.
Examples
El guardia siempre está alerta durante la noche.
The guard is always alert during the night.
Es importante que los conductores se mantengan alerta.
It is important that drivers remain alert.
Las niñas están alerta para ver si llega el cartero.
The girls are alert to see if the postman arrives.
It Stays the Same
This adjective is special because it does not change its ending to match the noun's gender (masculine/feminine) or number (singular/plural). It always stays 'alerta' (e.g., 'los hombres están alerta', 'la mujer está alerta').
Do Not Add an 'S'
Mistake: “Los niños están alertas.”
Correction: Los niños están alerta. (The word 'alerta' does not take an 's' when used as an adjective.)
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