abbreviation

LMK

el-em-KAY

LMK (abbreviation) means Let me know: used at the end of a message to ask someone to reply with an answer or a decision. Example: “I've booked the table for eight — lmk if that works.”

abbreviation

informal Let me know: used at the end of a message to ask someone to reply with an answer or a decision.

"I've booked the table for eight — lmk if that works."

"Sending the draft over now, lmk what you think."

How to Use LMK

Learner’s notes

In plain EnglishShort for "let me know".

When to use it

Informal; standard in texting and chat apps, out of place in formal correspondence.

Memory tip

Usually followed by "if", "when" or "what", exactly as the full phrase would be.

Trace the full origin ↓

Easily confused with

IDK → TBH → NVM →

Common pairings

lmk if you can make it lmk what you think lmk when you're free just lmk

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Test yourself on “LMK” A quick quiz — meaning, synonyms & usage →

Fill the Gap

Can you complete this real example?

I've booked the table for eight — _____ if that works.

Etymology

An initialism of "let me know".

Origin: English

Synonyms

View more →

let me know tell me keep me posted

Related Words

please advise

Frequently Asked Questions

What does LMK mean in a text?

It means "let me know". The sender is asking you to get back to them with a decision, an answer or an update, usually about something they have just proposed.

Is LMK rude?

No, it is simply casual. It is a normal sign-off in texts and instant messages between friends and, in many workplaces, between colleagues. In a formal email, write "let me know" or "please let me know" in full.

What is the difference between LMK and TBH?

They do different jobs. LMK asks for a reply. TBH means "to be honest" and introduces a frank opinion. LMK typically closes a message; TBH usually opens a statement.

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