cast doubt/suspicion on sb/sthC2to make people feel less sure about or have less trust in something or someone: New evidence has cast doubt on the guilty verdict.Damaging reputationDisapproving and criticizingcast aspersions on sb/sthformal›to criticize or make damaging remarks or judgments about someone or something: His opponents cast aspersions on his patriotism.Damaging reputationDisapproving and criticizing