Here are some examples of how it's used:
* "I tried to remember her name, but I drew a blank." This means the speaker couldn't recall the person's name.
* "The detectives questioned the suspect, but they drew a blank." This means the detectives were unable to get any useful information from the suspect.
* "I searched my entire apartment for my keys, but I drew a blank." This means the speaker couldn't find their keys, despite looking everywhere.
The idiom is often used in situations where someone is trying to recall information, solve a problem, or find something, but they are unable to do so.