Let that sink in: Here is What This Expression Really Means

The phrase let that sink in, is an idiom that refers to allowing (something) to penetrate or soak into your mental awareness and become understood.

There are several ways to look at the saying that can have either a positive or negative connotation- to either the idea (that sinks) or the subject (sinks in to).

Explanation: It may be that the idea is thick (with meaning itself or related results) and you must take a minute to consider all involved. Example: Student a."They say CoVid-19 hardly even affects young kids, so why don't we try and build herd immunity for the older folks?" Student b. "Let's assume that's 100% true, that would mean we would go back to the way it was, I wouldn't be in such a hurry to tell people that" student a. "why not" student b. "It's the end of July…..let that sink in" (August is the start of a regular school year)

Explanation: It May be that the idea is easily absorbed (obvious, general knowledge) and (you) are what is dense (slow, dimwitted).

Example: "Sheila said the party was cancelled Yesterday morning, but John and Tyrone said they were invited yesterday afternoon" "did you text her?" "Yes, she said it was a real bummer she had to cancel it, I hope everything's ok!" "I was invited this morning…I'm just going to let thank sink in for a minute"

Let that sink in: Here is What This Expression Really Means

What does it mean to say “let that sink in”?

English has some odd phrases that are used on a daily basis.

Most people never think about these, and use them all the time. If you’re not familiar with the phrase in question, this can be very confusing.

In this article, we’ll explain what “let that sink in” means and how to use it.


What does it mean when someone says “Let that sink in”?

The basic meaning of “let that sink in” is “think about that for a while.” This phrase is an idiomatic expression, or a poetic way of saying something for effect.
Think of your brain as a lake and a new piece of knowledge as a breadcrumb. The breadcrumb won’t sink into the lake immediately, and if you don’t think about the new piece of knowledge you’ll likely forget it.

When someone says “let that sink in,” then, they are just telling you to reflect on what you have just learned.


Different meanings of “let that sink in”

Although the same basic meaning of “think about that” is true for any use of this phrase, it can carry different nuances in different situations.

If someone is telling you something shocking, “let that sink in” might be an invitation to consider all the ramifications of what you have just learned.

On the other hand, if a teacher wants to make sure you understand a new piece of knowledge, they might say the phrase to suggest that you need to make sure you’ve memorized it before they can move on in their lesson.

Learning the difference between a clause and a phrase might not be mind-blowing, for instance, but because it’s confusing you might need to think about it a while to make sure you get the terms right.



The Earth orbits the Sun at more than 18 miles per second. That means it travels the distance from New York to London in 193 seconds, or just over three minutes. Pause for a moment to let that sink in.”

“Intransitive verbs never take a direct object. Let’s let that sink in for a moment, and we’ll move on.”

In the first example, the phrase “let that sink in” is used because it’s surprising to think how fast the Earth is moving through space.

Our first instinct is to dismiss the knowledge because we can’t easily picture it, so we have to pause and think it over until it has “sunk in” to our brain.

In the second example, intransitive verbs are not quite as exciting as the speed of our planet. All the same, intransitive verbs are important to understanding grammar.

Anyway, we can imagine that the speaker is a teacher delivering a lesson about verbs, and that they want their students to understand intransitive verbs before explaining other types of verbs.


When not to use “let that sink in”

Metaphors like “let that sink in” can be used in pretty much any context.

Like most forms of poetic language, however, they are best used sparingly.

If you say “let that sink in” after every new fact you give someone, they will quickly lose track of what parts you’re trying to emphasize.

Additionally, because this phrase implies that something you are saying is important, it doesn’t make sense to use it for trivial comments.

If you were to say “I’m going to cook an egg. Let that sink in.” the implication is that it’s very unusual indeed for you to cook an egg.

Finally, there may be some academic contexts in which this kind of metaphorical writing is discouraged.

This isn’t a very formal phrase, so if you’re writing a college paper or other document where you need to use formal language, you shouldn’t use “let that sink in.”

Instead, you might try the phrase “This can’t be overstated,” which accomplishes the same thing but is less poetic in nature.

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