Emphasise-Emphasize | Commonly Confused Words

Emphasise

/ˈɛmfəsʌɪz/

To give special importance or attention to something

/ˈemfəsaɪz/

To give special importance or prominence to something in speaking or writing

"Sure, sure," emphasized Clyde.Life for her meant emphasizing them.You don't need to emphasize that.

Emphasize is the preferred spelling in American English.
Emphasise is the preferred spelling in British English.
Both words have the same pronunciation and meaning, indicating the act of giving special importance or prominence to something.
The difference is purely a matter of regional spelling conventions.
You can determine which version to use based on your target audience's location.