expression, noun-modifying (irregular)
thunderstruck; struck by lightning
Fixed expression meaning literally hit by lightning; often used figuratively for being shocked or stunned.
He stood frozen to the spot as if struck by lightning.
A tree struck by lightning was blocking the road.
Literal passive expression from 雷 (thunder/lightning) + に + 打たれた (was struck). The figurative use is a natural extension of the literal meaning.