What is the meaning of Armchair?

A chair with supports for the arms or elbows.

Remote from actual involvement, including a person retired from previously active involvement.

Unqualified or uninformed but yet giving advice, especially on technical issues, such as law, architecture, medicine, military theory, or sports; relating to such advice.

To create based on theory or general knowledge rather than data.

To theorize based on analysis of data that was gathered previously; to reflect.

Source: wiktionary.org