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a fellow traveler
Someone who identifies with or is sympathetic to the aims or ideology of a political movement or organization, but is not a formal or full member of it. Used especially in the 1950s in reference to those suspected of being communist sympathizers. In my grandfather's day, if someone accused you of being a fellow traveler, it was often to derail your career completely. Despite having a mark against him as a "fellow traveler," he still managed to remain at the Hollywood elite.
an armchair traveler
One who speaks authoritatively about traveling despite not traveling often. Don't let him discourage you when he's just an armchair traveler who's never been out of the country!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a fellow traveller
A fellow traveller is someone who supports the aims of an organization but is not a member of it. Note: `Traveller' is spelled `traveler' in American English. Although something of a critical fellow traveller, Sampson was very interested in the party.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
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
Farlex Partner Idioms Dictionary © Farlex 2017