[with obj.]fail to fulfil the hopes or expectations of (someone) 使(某人)失望 I have no wish to disappoint everyone by postponing the visit. 我一点也不想因为推迟访问让大家失望。 ■prevent (hopes or expectations) from being realized 使(希望,期望)破灭
语源
late Middle English (in the sense 'deprive of an office or position'): from Old French desappointer