英和和英

to warn

take warning

an indication or sign suggesting cautiousness

relax one's vigilance

to withdraw a warning

to keep strict guard

exercise [use] caution

the act of taking precautions by patrolling

the action of taking or making strict precautions against something

to go at regular intervals round an area to see that there is no trouble

a warning-signal

a warning to be ready for danger

an early warning

We need to stay alert.

a state of emergency about which a warning needs to be issued

to develop alarming symptoms

You can't be too vigilant.

to be cautious of one's surroundings

Forewarned is forearmed.

We must guard against accidents―take precautions against accidents.

a loud warning signal produced by a burglar alarm

the state there being heavy security

a whistle that is used to signal a warning

a warning sign

the condition of there being heavy security