fill someone in

USAGE SUMMARY

The phrase "fill someone in" is correct and usable in written English.
It is typically used when you want to provide someone with information or updates about a situation they may not be aware of. Example: "Can you fill me in on what happened during the meeting yesterday?"

✓ Grammatically correct

News & Media

Science

Wiki

Human-verified similar examples from authoritative sources

Similar Expressions

59 human-written examples

"As an understudy, your job is to fill someone else's shoes and stand in someone else's spot," Ms. Litzsinger said.

The New York Times

Dragic, 25, is not alone in needing to fill someones shoes.

Huffington Post

"But from everything I have seen, it is never a good idea to take someone in just to fill a spot, especially at the beginning when you are setting the tone for your lab.

Science Magazine

"This isn't the first time I've been called upon to fill in for someone at the last minute, so I should be used to it, right?" Hughes said Thursday, laughing.

The New York Times - Sports

"He's not normally working in Egypt, and given that he's got no family, he was either volunteered or put his hand up to go to Cairo to fill in for someone over the Christmas period," said Andrew Greste, who last spoke to his brother by telephone on Christmas Day.

The Guardian

It is for a very desirable, short-term contract job (4 or 5 months) to fill in for someone who will be out on maternity leave.

Huffington Post

It's a bummer if the officiant is late or doesn't show up, but if your wedding coordinator isn't licensed to perform ceremonies, they can't fill in for someone who is.

Huffington Post

I know it sounds obvious but if you start at the bottom there is a chance that an opportunity may arrive to be on TV or fill in for someone Apply for a real time job at at TV studio.

WikiHow

If your workplace is open on Christmas Eve and/or Christmas Day (hospital, convenience store, movie theater), offer to fill in for someone who wants time off to be with their family.

WikiHow

When she was first hired, she had money to pay someone to fill in during her two vacation weeks.

The New York Times

The Jets hoped to find someone to fill in for Martin, so the workhorse of the offense would not become overworked.

The New York Times - Sports

Expert writing Tips

Best practice

Recognize that this phrasal verb is separable; you can say "fill John in" or "fill him in" with equal correctness.

Common error

Do not confuse "fill someone in" (to inform) with "fill in for someone" (to substitute for them at work). While they look similar, they serve entirely different communicative purposes.

Linguistic Context

The phrase "fill someone in" functions as a transitive, separable phrasal verb. According to Ludwig AI, it typically takes a human object between the verb and the particle or after the particle if the object is not a pronoun. It acts as an action verb describing the transfer of information.

Expression frequency: Common

Frequent in

News & Media

65%

Wiki

20%

Science

15%

Less common in

Formal & Business

10%

Encyclopedias

5%

Social Media

5%

Ludwig's WRAP-UP

The phrase "fill someone in" is a versatile and correct English phrasal verb primarily used to inform or update a person. Data from Ludwig shows that while it is highly prevalent in journalism and general writing, users must be careful not to confuse it with its cousin phrase "fill in for someone", which refers to job substitution. Ludwig AI confirms its status as a grammatically sound choice for both professional and casual dialogue. When you need to provide context, remember to use the structure "fill [person] in on [subject]" for maximum clarity. Whether you choose to "update someone" or use this idiomatic expression, it remains a staple of effective communicative English.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

bring someone up to speed

Idiomatic expression implying the person was previously behind on information.

brief someone

Suggests a more formal or professional summary of facts.

inform someone

A direct, neutral, and plain English alternative.

catch someone up

Focuses on bridging the gap between what is known and the current state.

update someone

Focuses specifically on providing the most recent information.

clue someone in

Often used when the person was previously 'in the dark' or unaware.

put someone in the picture

A British English idiom for providing necessary context.

apprise someone

A significantly more formal and academic alternative.

give someone the lowdown

Much more informal and colloquial usage.

keep someone posted

Suggests an ongoing process of providing updates rather than a one-time event.

FAQs

How do I use "fill someone in" in a sentence?

You use it to mean giving someone extra information they don't have. For example: "Please "fill me in" on what I missed during the meeting".

What is the difference between "fill someone in" and "fill in for someone"?

To "fill someone in" means to give them information, while to "fill in for someone" means to temporarily do their job because they are away.

Can I use "brief someone" instead of "fill someone in"?

Yes, "brief someone" is a great alternative, especially in professional or military contexts where the information is concise.

Is it "fill someone in" or "fill someone on"?

The correct phrasal verb is "fill someone in". If you want to specify the topic, you then add 'on', resulting in "fill someone in on" the situation.