1 N-COUNT (尤指竞赛中的)难题，棘手的问题 A teaser is a difficult question, especially one in a competition. (尤指竞赛中的)难题，棘手的问题 [informal]

2 N-COUNT 爱戏弄别人的人 A teaser is someone who makes fun of people in a slightly cruel way. 爱戏弄别人的人