dose            
 noun [ C ] uk/dəʊs/ us/doʊs/
B2 一剂
a measured amount of something such as medicine
  a high/low dose 大/小剂量 
 a dose of penicillin 一剂青霉素 
 The label says to take one dose three times a day. 标签上写着每次一剂,每日三次。 
 20 or 30 of these pills would be a lethal dose (= enough to kill you). 二三十粒这样的药丸就会达到致命剂量。 
 B2 一些(糟糕或不愉快的事)
an amount or experience of something, often something bad or unpleasant
  The government received a hefty dose of bad news this week. 本周政府得到了许多坏消息。 
UK She's got a nasty dose of flu. 她得了严重的流感。 
  UK slang淋病 
a case of gonorrhoea (= a disease of the sexual organs)
 - More examples
 - It is dangerous to take more than the recommended dose of this medicine.
 - The correct dose is one spoonful three times a day.
 
Idioms      
in small dosesidiom  短时间,一会儿,片刻
for short periods of time
  I can only stand opera in small doses. 歌剧我只能欣赏一小会儿。 
 like a dose of saltsidiom UK informal 迅速,快捷
very quickly
  The medicine went through me like a dose of salts. 这种药物很快就从我体内排出了。 
 dose       
verb [ T ] UK uk/dəʊs/ us/doʊs/
 给…开药;给…用药
to give someone a measured amount of medicine
 informal He dosed himself (up) with valium to calm his nerves. 他服了镇静药来缓解神经紧张。