What is the antonym of "assemble a team"?

Solution 1:

MorganFR wrote in a comment: "you're probably looking for disband or one of its synonyms."

Disband — M-W

transitive verb: to break up the organization of : dissolve
intransitive verb: to break up as an organization : disperse

"They've decided to disband the club."
"The members of the organization have decided to disband."

Solution 2:

dissolve.

See https://www.merriam-webster.com/dictionary/dissolve

Typical uses are to: dissolve parliament, dissolve a partnership, dissolve a marriage. "break up" is given as its synonym.

Part of the definition from Merriam-Webster:

transitive verb

1a : to cause to disperse or disappear : destroy (do not dissolve and deface the laws of charity — Francis Bacon)

1b : to separate into component parts : disintegrate (dissolved the company into smaller units)

1c : to bring to an end : terminate (the king's power to dissolve parliament) (their partnership was dissolved)

1d law : annul (dissolve an injunction)