early warning
noun /ˌɜːli ˈwɔːnɪŋ/
/ˌɜːrli ˈwɔːrnɪŋ/
[uncountable, singular]- a thing that tells you in advance that something serious or dangerous is going to happen
- an early warning of heart disease
- an early warning system (= of enemy attack)
- The sensors provide early warning of the approach of enemy troops.