tranq       
 noun [ C ]  informal uk/træŋk/ us/træŋk/
 镇静剂
a tranquillizer (= a drug used to make a person calmer, or to make an animal unconscious or calmer)
  a tranq gun/dart 发射镇静剂的枪/箭 
 tranq       
verb [ T ]  informal uk/træŋk/ us/træŋk/
 使(人或动物)昏迷
to tranquillize a person or an animal
  If they have to tranq a rhino, they do it from a distance. 如果他们不得不给犀牛打镇静剂使其昏迷的话,就必须从较远的地方进行。