I read the definition of ground beef on Cambridge just now
meat, usually beef, that has been cut up into very small pieces, often using a special machine
Then I realized that there are lots of verbs followed by "up", such as "cut up", "wash up".
Is "up" in this kind of phrases required or optional?
It seems that getting rid of up does affect the meaning at all, for example
ground beef is a kind of beef that has been cut into very small pieces.
Note: this post is NOT about general phrasal verb, such as stand up, turn up.
If "cut up" and "cut" have different meaning, please explain in detail, some other combination like "stand up", "wake up", cannot help me distinguish "cut up" and "cut".