insidiate

Example:The politician’s credibility was undermined when a scandal emerged.

Definition:to gradually weaken or damage the position, character, or success of a person or thing; to chip away at something gradually until it falls

Example:The competitor’s efforts to sabotage the project were discovered before they succeeded.

Definition:to deliberately and secretly damage the plans, efforts, or reputation of a person or group; to hinder someone or something in a covert and indirect way

Example:The leaked documents were a poison that cast doubt on the company’s integrity.

Definition:to make impure or add a harmful substance to, often to destroy someone’s health, position, or reputation; to cause harm or damage