Английский словарь американских идиом - throw in one's lot with

or {literary} cast in one's lot with {v. phr.} To decide to share or take part in anything that happens to; join. * /The thief decided to throw in his lot with the gang when he heard their plans./ * /Washington was rich, but he decided to cast in his lot with the colonies against Britain./ * /When Carl was old enough to vote, he threw in his lot with the Democrats./ Syn.: JOIN FORCES.