Idiom:
to grill someone;
used as a verb

First Example:
Theresa was really grilling Harry on their first date. She
was sure asking him all these questions about his preferences. He eventuall had
to ask her to stop. 

Second Example:
When Janice said she hadn’t done her
homework because she had to go to the hospital the night before, the teacher grilled her on what happened. The
teacher asked for so many details, Janice finally gave up and was honest,
explaining that she went to a movie.

Meaning: To “grill”
someone means to ask that person many questions, similar to a cross-examination
in a courtroom. In the first example/illustration above, Harry was grilled by his date; he thought her
questions were excessive. In the second example, Janice is grilled by her teacher, and she eventually admitted that she was
lying.