allay
v.v. to make a negative feeling, like fear or worry, less strong. You use this when you want to calm someone down or make a problem seem less scary.
v. to diminish or soothe a negative emotion, such as fear, suspicion, or concern. Often used in formal contexts to describe the reduction of public or personal anxiety.
The doctor's words helped allay her fears.
The government released a detailed report to allay public concerns about the safety of the new water treatment plant.
Despite the CEO's attempts to allay investor anxiety during the quarterly call, the stock price continued to fluctuate as market uncertainty remained high.
The verb is transitive and typically takes abstract nouns representing negative emotions (fears, doubts, concerns) as its direct object.