when you've seen one (something), you've seen them all

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when you've seen one (something), you've seen them all

All of these things are exactly alike; experiencing one of these things is enough to know what everything else of its kind will be like. Verbs other than "seen" are often used, such as "heard," "read," etc. I prefer dramas, if I'm honest. When you've seen one action movie, you've seen them all, as far as I'm concerned. I've never understood the appeal of all these different boy bands—when you've heard one, you've heard them all.
See also: all, one, seen
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

when you’ve seen, heard, etc. ˈone, you’ve seen, heard, etc. them ˈall

(saying) used to say that all types of the things mentioned are very similar: I don’t like science fiction novels much. When you’ve read one, you’ve read them all.
See also: all
Farlex Partner Idioms Dictionary © Farlex 2017

seen one, seen them all, if/when you've

They are all the same. This world-weary assertion was being made by the early nineteenth century. Mark Twain used it in Innocents Abroad (1869), “To me it seemed that when I had seen one of these martyrs I had seen them all.” See also been there, done that.
See also: if, seen
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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