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

1. To join another person or become part of a group. Don't worry, Mom—I really don't care about throwing my lot with the cool kids at school.

2. To give one's steadfast support to some 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.

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.

throw in your lot with somebody

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

throw in your ˈlot with somebody