Meaning of ALERT in English
▪ heightened , high
The country has put its troops on high ~.
▪ amber , orange , red , yellow
His sudden disappearance triggered a red ~ among his friends.
▪ bomb , fire , flood , pollution , security , terror
A security ~ was issued after four men escaped from the prison.
Receive regular email ~s about breaking news.
VERB + ALERT
▪ issue , put out , raise , sound
They rang the bells to sound the ~.
▪ spark ( esp. BrE ), trigger
▪ call off
The ~ was called off when it was found that the bomb was not live.
ALERT + VERB
▪ go out
A nationwide ~ went out for three escaped prisoners.
▪ on the ~
▪ ~ for
You should always be on the ~ for anyone who looks suspicious.
▪ be on full ~
The security forces are now on full ~.
▪ place sb on ~ , put sb on ~
Thousands of police were put on full ~ at all main roads leading to the city.
▪ keep sb on ~
▪ a state of ~
The army was yesterday placed on a state of ~ in case of more riots.
Alert is used with these nouns as the object: ↑ authority , ↑ police , ↑ press
▪ be , look , seem
▪ remain , stay
▪ keep sb
The machine should help to keep the pilot ~.
▪ extremely , fairly , very , etc.
▪ immediately , instantly , suddenly
There was a noise outside and he was suddenly ~.
▪ always , constantly
He was as mentally ~ as a man half his age.
Climbers need to be ~ to possible dangers.
Alert is used with these nouns: ↑ expression , ↑ reader
Oxford Collocations English Dictionary. Оксфордский английский словарь словосочетаний . 2012