殃及 means 'to bring disaster upon' or 'to involve in trouble', often used when a mistake, accident, or larger calamity spreads harm to innocent people or things. It has a formal or literary register; the common idiom 城门失火，殃及池鱼 ('when the city gate catches fire, the fish in the moat suffer') illustrates how trouble can indirectly affect bystanders. It is typically followed by a noun phrase — the victim of the spillover harm.