The idiom "split up" means to end a relationship or to separate from someone. It is often used to describe the end of a romantic relationship, but it can also be used to describe the end of a friendship or business partnership.
For example, you can say "John and Mary split up last week" to mean that John and Mary ended their romantic relationship. Or you can say "The business partners split up after a disagreement" to mean that the partners ended their business partnership.
The phrase is usually used in informal conversations, and it can be used in both positive and negative contexts. It is important to note that "split up" is a phrasal verb, which means that it is made up of two or more words that function as a single unit of meaning.
In summary, "split up" means to end a relationship or to separate from someone, and it is used in informal conversations to describe the end of a romantic relationship, friendship, or business partnership.
• The political party split up into two factions over a disagreement on policy.
• My friends and I split up after school to go home.
• They had to split up the tasks among the team members to finish the project on time.
• The couple decided to split up after realizing they were not compatible.
• The company decided to split up into different divisions to focus on specific areas of business.
• It was difficult for the family to split up their father's estate after he passed away.