Complex sentence: The term is also used allusively for any person who gives advice and instructions in areas they are not responsible for, or subjects they may not understand well, similar to "armchair" professional "" terms like armchair general.
Split into simpler sentences: The term is also used allusively for any person who intervenes with advice and instructions in affairs they are not responsible for, or subjects they may not understand well. This is in a manner similar to "armchair" professional "" terms like armchair general.