Literal meaning (disease or decay):
* The blight on the potato crops caused a widespread famine.
* The city's once-vibrant downtown was now a blight of abandoned buildings.
* The blight of war ravaged the countryside, leaving it barren and desolate.
Figurative meaning (something that ruins or spoils):
* The constant noise and litter were a blight on the neighborhood's peace.
* His gambling addiction became a blight on his family's life.
* The politician's corrupt practices were a blight on the political system.
As a noun:
* The farmer inspected his crops for signs of blight.
* The blight on the tomatoes was caused by a fungal infection.
As a verb:
* The fungus blighted the entire potato crop.
* The war blighted the country's future.