Meaning of the word "Up to you" in English

What does "Up to you" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Up to you

US /ʌp tu ju/
UK /ʌp tu juː/

Phrase

it is your decision or responsibility

Example:
What do you want to do tonight? It's up to you.
You can choose any color you like, it's completely up to you.