siren song
An enticing but dangerous appeal, especially a misleading one.
Romance never sang to him her siren song, and Adventure had never shouted in his sluggish blood.
ADJ
approaching
We could hear the approaching siren getting louder as the ambulance raced down the street.
air-raid, ambulance, factory, police, warning
VERB + SIREN
put on, sound, switch on
When the fire alarm went off, someone switched on the siren to warn people in the building.
hear
SIREN + VERB
go (off), sound, start
blare, howl, scream, wail
The fire truck's siren screamed as it rushed through the busy intersection.
die away
The ambulance siren died away as the vehicle disappeared around the corner.