knock (someone) over with a feather

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knock (someone) over with a feather

To shock, confuse, or astonish someone to a point of complete bewilderment; throw someone for a loop. More often phrased as "you could have knocked me over with a feather," expressing great bewilderment or surprise. It really knocked me over with a feather to hear that my ex-wife had already remarried. I was so taken aback when I found out I'd won the lottery that you could have knocked me over with a feather!
See also: feather, knock