to inquire (about); to enquire; to ask
to interrogate; to question intensely; to grill (someone about something); to ask (someone) to explain
彼女は容疑者に細かく問い質した。
She questioned the suspect in detail.
弁護士は証人を時間をかけて問い質している。
The lawyer is taking time to question the witness.
相手の言葉を信じず、一つひとつ問い質すのが彼の癖だ。
He has a habit of questioning everything the other person says, one by one.