Why was 1847 called black 47?

1847 was termed "Black '47" due to the devastating impact of the Great Famine in Ireland, which peaked during that year. A catastrophic failure of the potato crop, a staple food for much of the population, led to widespread hunger, disease, and death. The government's inadequate response exacerbated the crisis, resulting in approximately one million deaths and mass emigration. This year is often remembered as the most tragic point in the famine's history.