Throw in your lot with somebody - Idioms by The Free Dictionary
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.
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.