If you probe into something, you ask questions or try to discover facts about it.

If a doctor or dentist probes, he or she uses a long instrument to examine part of a patient's body.

A probe is a long thin instrument that doctors and dentists use to examine parts of the body.

If you probe a place, you search it in order to find someone or something that you are looking for.

In a conflict such as a war, if one side probes another side's defences, they try to find their weaknesses, for example by attacking them in specific areas using a small number of troops.

A space probe is a spacecraft which travels into space with no people in it, usually in order to study the planets and send information about them back to earth.