fill sb in

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US /fɪl/ 
UK /fɪl/ 

Longman Dictionary of Contemporary English

TELL SOMEBODY NEWS fill somebody ↔ in to tell someone about recent events, especially because they have been away from a place
fill somebody ↔ in on
I think you’d better fill me in on what’s been happening.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

fill sb in — phrasal verb with fill / fɪl / verb

to give someone extra or missing information:

I filled her in on the latest gossip.

© Cambridge University Press 2013

Collins Advanced Learner’s English Dictionary

3) PHRASAL VERB If you fill someone in, you give them more details about something that you know about. [INFORMAL]
  [V n P] I didn't give Reid all the details yet - I'll fill him in...
  [V n P on n] He filled her in on Wilbur Kantor's visit.

Merriam-Webster's Advanced Learner's Dictionary

3) PHRASAL VERB If you fill someone in, you give them more details about something that you know about. [INFORMAL]
  [V n P] I didn't give Reid all the details yet - I'll fill him in...
  [V n P on n] He filled her in on Wilbur Kantor's visit.