Looking for the verb phrase be on the alert instead?
1. (watchful) 
a. alerta 
Stay alert! There's a killer on the loose.¡Mantente alerta! Anda un asesino suelto.
b. atento 
We had to be alert so that we wouldn't miss the hidden frame in the movie.Tuvimos que estar atentos para no perdernos el fotograma oculto en la película.
2. (mentally acute) 
a. despierto 
I'm not alert until I have my daily cup of coffee.No estoy despierto hasta que me tomo mi taza diaria de café.
3. (surveillance) 
a. la alerta (F) 
The police are on the alert for the two men who attacked our neighbor.La policía está en alerta por dos hombres que atacaron a nuestra vecina.
transitive verb
4. (to warn) 
a. alertar 
She alerted the fire marshal to the potential hazards in the building.Alertó al jefe de bomberos de los peligros potenciales del edificio.
b. poner sobre aviso 
He alerted the police that the wanted man was hiding in the woods.Puso sobre aviso a la policía de que el hombre que buscaban se escondía en el bosque.
1. (general) 
a. la alerta (F) 
to be on the alertestar alerta
2. (mind) 
a. lúcido(a) 
to be alertestar alerta or vigilante
to be alert to somethingser consciente de algo
transitive verb
3. (general) 
a. alertar 
he alerted them to the dangerlos alertó del peligro
alert [əˈlɜːt]
1 (mentally acute) [+person] espabilado; despierto
He's nearly 90 now but still mentally alert
[+expression] vivo
they were alert eran espabilados; tenían la mente despierta; he's a very alert baby es un bebé muy despierto
2 (vigilant) alerta; atento
We all have to stay alert He had been spotted by an alert neighbour
we must stay alert hay que estar atentos
3 (aware)
to be alert to sth ser consciente or al tanto de algo
The bank is alert to the danger He said the US would be very alert to the possibility of terrorism Bringing a new pace to the musical, he was continually alert to fresh developments ...
alerta (f)
They have isued an alert to banks and financial insitutions around the world after a robbery in which ... Due to a security alert, this train will not be stopping at Oxford Circus
to be on the alert estar alerta; to put or place troops on (the) alert poner a las tropas sobre aviso or en situación de alerta
transitive verb
alertar; poner sobre aviso
I was hoping he'd alert the police
to alert sb to sth alertar a algn de algo; poner a algn sobre aviso de algo; we are now alerted to the dangers ahora estamos sobre aviso en cuanto a los peligros
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