four-minute warning
A UK government public alert system in use during the Cold War to advise of an imminent nuclear attack.
ADJ
awful, dire, grim, ominous, stark, stern, strong
The doctor gave her a stern warning about the risks of ignoring her health problems.
urgent
adequate, advance, ample, due, early, fair, prior
The airline gave passengers adequate warning before the flight was cancelled.
clear, direct
coded
The terrorist group sent a coded warning before the attack on the building.
initial
final
The teacher gave her students a final warning before the exam rules would be strictly enforced.
formal, government, official
salutary, timely, useful
His friend's accident was a timely warning about the dangers of driving too fast.
friendly
veiled
His comment about the deadline was a veiled warning to complete the project on time.
audible, visual
The car's visual warning light came on when the engine temperature got too high.
verbal, written
The teacher gave him a verbal warning after he arrived late to class three times.
air-raid, bomb, fire, flood, gale, hazard, storm
The meteorological service issued a gale warning for coastal regions yesterday evening.
health, safety
The restaurant received a safety warning after inspectors found problems in the kitchen.
VERB + WARNING
give (sb), issue
The doctor gave me a warning about eating too much sugar before my next visit.
shout (out), sound
The fire alarm sounded a warning when smoke filled the kitchen.
reiterate, repeat
be, serve as
The accident at the factory should serve as a warning to other companies about workplace safety.
get, receive | ignore
heed
If you heed warnings about expired food, you can avoid getting sick.
WARNING + VERB
come
The fire alarm warning came too late for us to escape safely.
sound
The fire alarm sounded a warning when smoke was detected in the building.
WARNING + NOUN
notice, sign
The weather service issued a warning notice about the approaching storm.
bell, device, light, signal, system
PREP
in ~
She raised her hand in warning before the child ran into the street.
without ~
The power went out without warning during dinner last night.
~ about
The doctor gave her a warning about eating too much salt for her heart condition.
~ against
The safety officer issued a warning against leaving machinery unattended during shifts.
~ of
The weather service issued a warning of heavy storms expected tonight.
~ to
The doctor gave a warning to patients about the dangers of smoking.
PHRASES
a word of warning
Before you start the project, I should offer a word of warning about the tight deadline.