low-down
noun /ˈləʊ daʊn/
  /ˈləʊ daʊn/
the low-down
 [singular] (informal)- the low-down on (somebody/something) the true facts about somebody/something, especially those considered most important to know真相;(尤指)重要事实 - Jane gave me the low-down on the other guests at the party.简告诉了我聚会上其他来宾的真实情况。 
 
- Jane gave me the low-down on the other guests at the party.