you could have knocked me etc. down with a feather
释义
●you could have knocked me, etc. down with a ˈfeather (informal) used to tell sb about a very surprising experience(表示惊讶)真让人大吃一惊;令人大跌眼镜◆When they said how much the painting was worth, you could have knocked me down with a feather!当他们告诉我这幅画值多少钱时,我惊得目瞪口呆!