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