to have information in your mind as a result of experience or study, to be certain that something is true or exists, to be familiar with someone or something

you never know, know the ropes, know which side one's bread is buttered on

know by heart, know for a fact, know one's way around

Formal and Informal Expressions of know

In different contexts, you can replace 'know' with suitable alternatives. In a more formal setting, 'be acquainted with, be cognizant of, be apprised of' is apt. In informal speech or writing, 'get, catch on, figure out' is a commonplace synonym.

know: Explore its Definition & Usage

know Definition

1to have information in your mind as a result of experience or study
2to be certain that something is true or exists
3to be familiar with someone or something

Using know: Examples

Take a moment to familiarize yourself with how "know" can be used in various situations through the following examples!

Example
I know how to play the guitar.
Example
I know that the Earth revolves around the Sun.
Example
Do you know John?
Example
I don't know what to do.

know Synonyms and Antonyms

Synonyms for know

Antonyms for know

Idioms Using know

you never know
used to say that anything can happen and it is impossible to be sure about the future
Example
You never know, maybe you'll win the lottery someday.
know the ropes
to be familiar with the procedures and methods of doing something
Example
He knows the ropes of this job better than anyone else.
know which side one's bread is buttered on
to understand where one's interests lie and act accordingly
Example
He knows which side his bread is buttered on and always agrees with the boss.

Phrases with know

know by heart
to have memorized something completely
Example
She knows all the lyrics to that song by heart.
know for a fact
to be absolutely certain about something
Example
I know for a fact that he didn't steal the money.
know one's way around
to be familiar with a place or situation
Example
She knows her way around the city like a local.

Origins of know

from Old English 'cnāwan'

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Summary: know in Brief

The verb 'know' [noʊ] refers to having information in one's mind from experience or study, being certain of something, or being familiar with someone or something. It is often used in phrases like 'know by heart,' meaning to have memorized something completely, and idioms like 'you never know,' implying uncertainty about the future. 'Know' has formal synonyms like 'be acquainted with' and informal ones like 'figure out.'