throw in your lot with somebody

throw in (one's) lot with (someone or something)

To join and steadfastly support another person or group. As soon as news of the CEO's scandal becomes public, I doubt that big investor will want to throw in her lot with us. Don't worry, Mom—I really don't care about throwing in my lot with the cool kids at school.
See also: lot, throw

throw in your ˈlot with somebody

decide to join a person or an organization, so that you share their luck, both good and bad: He left his job in the National Theatre to throw in his lot with a small travelling theatre company.
See also: lot, somebody, throw