mixed metaphor       
noun [ C ] uk/ˌmɪkst ˈmet.ə.fɔːr/ us/ˌmɪkst ˈmet̬.ə.fɔːr/
 (常产生愚蠢、滑稽效果的)混合隐喻
a combination of two or more different metaphors, often producing a silly or humorous effect
  "The new job has allowed her to spread her wings and really blossom," is a mixed metaphor. “新工作让她能展开翅膀、真正绽放”是一个混合隐喻。