an area of red spots on a person’s skin, caused by an illness or a reaction to sth 皮疹；疹
I woke up covered in a rash.
我醒来时长了一身皮疹。
I come out in a rash (= a rash appears on my skin) if I eat chocolate.
我一吃巧克力就长皮疹。
The sun brought her out in (= caused) an itchy rash.
太阳晒了她一身痱子，很痒。
a heat rash (= caused by heat)
痱子
adjective impulse
(of people or their actions 人或行为) doing sth that may not be sensible without first thinking about the possible results; done in this way 轻率的；鲁莽的 SYN reckless
a rash young man
鲁莽的年轻人
~ (to do sth)
It would be rash to assume that everyone will agree with you on this.
你要是认为在这件事上谁都会同意你的看法，那就太欠考虑了。
Think twice before doing anything rash.
不要草率行事，要三思而行。
This is what happens when you make rash decisions.
这就是你贸然作决定的后果