'Prise out' often means physically removing something stuck, usually with tools or careful effort.

Physical Effort

It can also be used metaphorically to describe a difficult task not involving physical objects.

Metaphoric Use

Sometimes 'prise out' is used when nothing physical is removed, such as 'prising out' a smile.

'Prise out' suggests being sensitive to others' feelings when trying to obtain sensitive information.

The phrase indicates that persistence is often necessary to get the information wanted.

During informal chats, people might 'prise out' information without the other person's awareness.