throw in one's lot with

idiomatic phrase

: to join or become associated with a person, group, or thing that one hopes will win or succeed

Fence-straddlers may now throw in their lot with the new government.

—Evan Thomas and Rod Nordland

He threw in his lot with the pro-tariff side even more during the Great Depression.

—Michael Hiltzik

Word History

First Known Use

1870, in the meaning defined above