The phrase "sweep feet" refers to a physical action often seen in sports or dance, where a person uses their leg to knock someone else off balance by sweeping their feet from under them. Synonyms for this action could include words like trip, topple, knock down, or even tackle. These all describe the act of causing someone to lose their balance and fall to the ground. Depending on the context, other synonyms could be shove, push, or nudge, which might imply a slightly less aggressive action. Overall, there are many words that can be used to describe the act of sweeping someone's feet and causing them to fall, each with slightly different connotations.