1N-COUNT (醉酒后的)宿醉 If someone wakes up with a hangover, they feel sick and have a headache because they have drunk a lot of alcohol the night before. (醉酒后的)宿醉
2N-COUNT 遗留观念(或习俗) Something that is a hangover from the past is an idea or way of behaving which people used to have in the past but which people no longer generally have. 遗留观念(或习俗)
As a hangover from rationing, they mixed butter and margarine. [+ from]