What does it mean to 'loop someone in' on an email?

What it means: To include someone in a conversation, email thread, or process so they're kept informed. "Loop me in" = "add me to this so I know what's happening." The image comes from joining a loop - becoming part of a connected chain.

• "Can you loop in Sarah? She needs to know about this."
• "I'll loop you in on the email thread."
• "Keep me looped in on any updates." (slightly different - means keep me updated)

Why natives say this: It's more specific than "tell them" - it implies continuous involvement, not just a one-time update. Looping someone in usually means they'll see the ongoing conversation, not just a summary.

• "CC them in" - specifically about email (CC = carbon copy)
• "Keep them in the loop" - slightly different: means keep them updated regularly
• "Bring them up to speed" - means update someone who's been out of the conversation
• "Rope them in" - different meaning: get someone involved in doing work, not just being informed

Register: Professional. Very common in workplace email and meetings. Informal enough that it wouldn't appear in formal documents, but standard in everyday business communication.

Tags: workplace English, email, communication, corporate English