Definition of out of a clear sky in English:

out of a clear sky

phrase

  • As a complete surprise.

    ‘his moods blew up suddenly out of a clear sky’
    • ‘Aware that such social tornadoes can twist towards them out of a clear sky, governments have learned to be cautious.’
    • ‘I've heard of lightning coming out of a clear sky.’
    • ‘When angered, people burn, things break and fly around, lightning may strike out of a clear sky.’
    • ‘However, the acts did not come out of a clear sky.’