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Related to armchair: armchair general
One who speaks authoritatively on topics one actually knows little to nothing about. My uncle is such an armchair general about the classes I'm taking—the fact that he never went to college doesn't stop him from weighing in! Stop being an armchair general and let me fix my car, since I actually know what I'm doing here!
an armchair something
An armchair critic, fan, traveller, etc. is interested in a particular subject and may talk about it, but does not have any real experience of it. The last thing we need are words of wisdom from an armchair critic. This great book is ideal for both the travelling supporter and the armchair fan.
an armchair critica person who knows about a subject only by reading or hearing about it and criticizes without active experience or first-hand knowledge.
The phrase armchair critic is first recorded in 1896 , but the concept was around at least a decade earlier: in 1886 Joseph Chamberlain sneered at opponents as ‘arm-chair politicians’. Another common variant is armchair traveller , meaning ‘someone who travels in their imagination only’.
an armchair critic, traveller, etc.a person who knows about a subject only from what they have heard or read and not from personal experience: He’s what you might call an ‘armchair traveller’, having never actually been outside Europe.
See also: armchair