bipolar disorder
noun🔊/ˌbaɪˈpəʊlə dɪsɔːdə(r)/
🔊/ˌbaɪˈpəʊlər dɪsɔːrdər/
(also bipolar affective disorder)
[uncountable, countable] (also old-fashioned manic depression [uncountable])
(a mental illness causing somebody to change suddenly from being extremely depressed to being extremely happy 双相型障碍；躁狂抑郁性精神病