Floored me??

The promotion was so unexpected it completely floored me. I wasn’t able to say
anything and just stood in my manager’s office , dumbfounded.

以上這句的floored me是啥意思??
floor我記得是地板......
更新: DaSaGwa大大您好:
我查了floor的意思,沒有驚嚇的意思阿......

蘇庭大大:感謝您的回答......可是感覺像是翻譯機
更新 2: 感謝各位大大說明,所以說floor在這是延伸應用的意思
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