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activeness, agility, attentiveness, briskness, carefulness, circumspection, heedfulness, liveliness, nimbleness, perceptiveness, promptitude, quickness, readiness, spiritedness, sprightliness, vigilance, wariness, watchfulness  
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  ( alerts    plural & 3rd person present)   ( alerting    present participle)   ( alerted    past tense & past participle  )
1       adj   If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen.   (=attentive)  
We all have to stay alert..., He had been spotted by an alert neighbour.     
   alertness             n-uncount  
The drug improved mental alertness.     
2       adj   If you are alertto something, you are fully aware of it.  
v-link ADJ to n  
The bank is alert to the danger.     
3       n-count   An alert is a situation in which people prepare themselves for something dangerous that might happen soon.  
Due to a security alert, this train will not be stopping at Oxford Circus.     
4       verb   If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it.  
He wanted to alert people to the activities of the group...      V n to n  
I was hoping he'd alert the police.      V n  
    red alert  
6    If soldiers or police are on alert, they are ready to deal with anything that may happen.  
on alert      phrase   PHR after v, v-link PHR  
Soldiers and police have been put on alert.     
7    If you are on the alertfor something, you are ready to deal with it if it happens.  
on the alert      phrase   PHR after v, v-link PHR  
They want to be on the alert for similar buying opportunities.     

red alert        ( red alerts    plural  ) If a hospital, a police force, or a military force is onred alert, they have been warned that there may be an emergency, so they can be ready to deal with it.      n-var  
All the Plymouth hospitals are on red alert...     

Traduction Dictionnaire Collins Anglais pour Apprenants  

Consulter aussi:

alert, adulteress, adeptness, artless

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