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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.
See also: fellow, traveler

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!
See also: armchair, traveler

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.
See also: fellow, traveller

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
References in classic literature ?
Serious objections,' remarked the Provincial Mayor, with an air of impartiality, turning towards the Time Traveller.
Not a bit,' said the Time Traveller, and, to the Psychologist: `You think.
Then the Time Traveller asked us what we thought of it all.
Upon that machine,' said the Time Traveller, holding the lamp aloft, `I intend to explore time.
But first the insinuating traveller had asked him if they could have some wine made hot; and as he had answered Yes, and had presently afterwards sent it in, that traveller, seated in the centre of the group, and in the full heat of the fire, was soon engaged in serving it out to the rest.
She had expected to meet the lady's husband approaching it; but the person in the gallery was not he: it was the traveller who had wiped the wine- drops from his moustache with the piece of bread.
She went down, not easily hiding how much she was inclined to shrink and tremble; for the appearance of this traveller was particularly disagreeable to her.
The traveller had been at the pains of going a long way up-stairs to his sleeping-room to fetch his pocket-flask of brandy.
We poor gentlemen, sir,' said the traveller, pulling his moustache dry with his hand, for he had dipped it in the wine and brandy; 'we poor gentlemen do not travel like princes, but the courtesies and graces of life are precious to us.
said the traveller, rising and holding the door open, as the gentleman crossed the room towards it with his arm drawn through his daughter's.
said the insinuating traveller, whose manner shrunk, and whose voice dropped when he was left alone.
Darkness, outstripping some visitors on mules, had risen thus to the rough convent walls, when those travellers were yet climbing the mountain.
Gabriel resumed his seat, and looked wistfully up the road by which the traveller had come; murmuring in a half whisper:
Though the thermometer at mid-day ranged from eighty to ninety, and even sometimes rose to ninety-three degrees, yet occasional spots of snow were to be seen on the tops of the low mountains, among which the travellers were journeying; proofs of the great elevation of the whole region.
As the travellers continued to advance, they became more and more sensible of the elevation of the country.