draw a blank
draw a blank  {v. phr.},  {informal}
1. To obtain nothing in return for an effort made or to get a negative result. 
I looked up all the Joneses in the telephone book but I drew a blank every time I asked for Archibald Jones.
2. To fail to remember something. 
I am trying to think of the name but I keep drawing a blank.
3. To be consistently unsuccessful at doing something. 
I keep trying to pass that math exam but each time I try it I draw a blank.
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Source: A Dictionary of American Idioms
