Definition of Chicken Little in English:

Chicken Little

noun

North American
  • An alarmist or person who panics easily.

    as modifier ‘Chicken Little travel agents say the place is dangerous’
    • ‘Even if they miss your head, a 2-foot pine cone dropping nearby can give you a Chicken Little moment.’
    • ‘These are pathetic reasons for our representatives in Congress to be in a Chicken Little mode.’
    • ‘He views these as the squawks of a Chicken Little inciting panic and skepticism.’
    • ‘Few people blink these days when some Chicken Little somewhere announces that the virtual sky is falling.’
    • ‘And that's important to know as well, so that we're not in a Chicken Little type situation.’

Origin

1920s: from the name of a character in a nursery story who repeatedly warns that the sky is falling down.