I think the second is "United would knock the spots off us." I'm pretty sure that's British. It means to beat decisively, for example in sports. "United" sounds to me like the way the British name soccer teams.

Hi) This exercise was in my olympiad. I should not created. I should shose word such us class,streets, common,head,spots,cheese. And filled the gaps.

Hi, Before I can answer this question I feel obligation to inform you that idioms are very rarely created. most of the time we hear an idiom that has been used and pick up on it from there. i.e "hold your tongue". that being said, what are you trying to accomplish with a concrete structure for an idiom? is it an assignment for class?