psych someone out
phrasal verb with psych verb uk/saɪk/ us/saɪk/
informal
（尤指在体育比赛中）吓住，镇住（对手）
to behave in a very confident or forceful way in order to make a competitor, especially in a sports event, feel less confident
Both athletes were trying to psych each other out before the race. 两个运动员都试图在赛前把对方镇住。