get the wrong end of the stick
US /ɡɛt ðə rɔŋ ɛnd əv ðə stɪk/
UK /ɡɛt ðə rɔŋ ɛnd əv ðə stɪk/

1.
完全误解, 搞错了
to misunderstand something completely
:
•
I think you've got the wrong end of the stick; I meant we should meet for coffee, not dinner.
我想你完全误解了;我的意思是我们可以喝咖啡,而不是吃晚餐。
•
Don't get the wrong end of the stick; I'm not angry, just disappointed.
不要误解;我不是生气,只是失望。