Meaning of ALERT in English

ALERT

I.

noun

ADJECTIVE

▪ heightened , high

The country has put its troops on high ~.

▪ full

▪ amber , orange , red , yellow

His sudden disappearance triggered a red ~ among his friends.

▪ nationwide

▪ bomb , fire , flood , pollution , security , terror

A security ~ was issued after four men escaped from the prison.

▪ email

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.

PREPOSITION

▪ on the ~

▪ ~ for

You should always be on the ~ for anyone who looks suspicious.

PHRASES

▪ 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.

II.

verb

Alert is used with these nouns as the object: ↑ authority , ↑ police , ↑ press

III.

adj.

VERBS

▪ be , look , seem

▪ become

▪ remain , stay

▪ keep sb

The machine should help to keep the pilot ~.

ADVERB

▪ extremely , fairly , very , etc.

▪ fully

▪ immediately , instantly , suddenly

There was a noise outside and he was suddenly ~.

▪ always , constantly

▪ mentally

He was as mentally ~ as a man half his age.

PREPOSITION

▪ to

Climbers need to be ~ to possible dangers.

Alert is used with these nouns: ↑ expression , ↑ reader

Oxford Collocations English Dictionary.      Оксфордский английский словарь словосочетаний .