1 [I,T] to become or to make sth smaller by letting the air or gas out of it 泄气；放出空气或气体: The balloon slowly deflated. 气球慢慢瘪下去。 [OPP] inflate 反义词为inflate

2 [T] to make sb feel less confident, proud or excited 使泄气；挫（某人的）傲气: I felt really deflated when I got my exam results. 我拿到考试成绩时确实感到泄气。