fish or cut bait idiom US informal
要么全力以赴，要么索性放弃;下定决心就别再动摇
used to tell someone to take action or to stop saying that they will
He's been promising voters that he'll support gun control, now it's time to fish or cut bait. 他一直向选民许诺他会支持枪支管制，现在是下定决心的时候了。