har ‧ bin ‧ ger /ˈhɑːbɪndʒə $ ˈhɑːrbɪndʒər/ BrE AmE noun [countable] literary or formal
[ Date: 1100-1200 ; Language: Old French ; Origin: herbergere 'host' , from herberge 'place you stay at' ]
a sign that something is going to happen soon
harbinger of
These birds are considered to be harbingers of doom.