clue someone in
phrasal verb with clue verb uk/kluː/ us/kluː/ clueing or cluing | clued
informal mainly US (UK also clue someone up)
给…提供线索;使…了解
to give someone information that is necessary or new
He'd been out of the country for weeks, so I clued him in on all that's been happening. 他好几个星期都不在国内，因此我把发生的事情全都告诉了他。
If you've never been to New York City before, let me clue you in.
Ask your boyfriend to clue you up on his friends before you meet them, to make conversation easier.