draw a blank
US /drɔː ə blæŋk/
UK /drɔː ə blæŋk/

1.
想不起來, 一無所獲
to fail to get a result or to find information
:
•
I tried to remember her name, but I just drew a blank.
我試圖記住她的名字,但我就是想不起來。
•
The police questioned him for hours, but they drew a blank.
警方審問了他幾個小時,但他們一無所獲。