cast (one's) lot in 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 casting my lot in with the cool kids at school. I don't think Frank's a very good businessman—which is why I didn't cast my lot in with his latest venture. Your table at the Activities Fair needs more pizazz! No one is going to cast their lot in with a club that looks and sounds boring.
2. To give one's steadfast support some person or group. As soon as news of the CEO's scandal becomes public, I doubt that big investor will want to cast her lot in with us. If I were you, I wouldn't cast my lot in with such a polarizing political candidate. A: "They're my family—of course I'm going to cast my lot in with them." B: "Even knowing that their business is likely going bankrupt?"
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