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This is purely a curiosity, but I'm fascinated by mid-word pluralization, even if the word in question is a compound word.

For example, passersby or standersby.

No others have occurred to me. Can you provide other examples, or a link to a resource that enumerates them?

I'm particularly interested in compounds that do not include spaces or hyphens.

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    Hmm, haven't seen "standersby" before, only "bystanders" (usually as in "innocent bystanders"; though, as every copper knows, nobody is innocent ;-) – Jürgen A. Erhard Jan 11 '11 at 2:03
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    Especially bypassers, these guys always plot something sinister ;) – Septagram Jan 11 '11 at 7:18
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  • @Rob Perfection. – Jay Jan 12 '11 at 1:07
  • @JürgenA.Erhard That's exactly the mentality of why I get nervous around cops – Zach Saucier Sep 14 '15 at 4:31
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It could be any compound noun of which the head, the "main noun", is not the final part of the compound. This includes all compound nouns whose final parts are not nouns. "Bystanders" is normally not written as you did. In "passers-by", the final part is "by", which is not a noun. Note that there might be some controversy about the correct spelling of some such words, but I just try to be consistent. A few examples:

  • runners-up
  • fins-de-siècle (and many more French words)
  • houses of cards
  • Commanders-in-Chief
  • sons-in-law
  • attorneys at law
  • (tea)spoonsful
  • ...
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    Except for the word in-law itself, oddly :) – Kosmonaut Jan 11 '11 at 4:06
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    @Kosmonaut: Hey I never realized that. I suppose no other choice was left when the head got dropped. Still, an amusing plural. Cf. syntax-less compounds like "drop-outs" — or is there some syntax? Is it a phrase noun (or what are those called)? – Cerberus_Reinstate_Monica Jan 11 '11 at 4:17
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    And let's not forget attorneys at law. Hmm, on second thought, maybe we should just forget them. – Robusto Jan 11 '11 at 4:35
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    I wonder if database counts as one of these. – Tragicomic Jan 11 '11 at 6:43
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    This wikipedia article has a lot of examples of this kind if you scroll down to the seventh subhead (Plurals of compound nouns): en.wikipedia.org/wiki/English_plural – Tragicomic Jan 11 '11 at 6:50
8

Men-o’-war is a nice one: shows that irregular plurals are just as susceptible to this construction.

Also: pickers-up, on the same pattern as passers-by.

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7

And a few more from Wikipedia:

  • bills of attainder
  • directors general
  • fees simple absolute
  • ships of the line
  • ministers-president
  • knights-errant
  • procurators fiscal
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4

Besides those in others' answers, there are: attorneys general, secretaries general, solicitors general, postmasters general, governors-general, etc.; [noun]s-elect; and Knights Templar and Knights Hospitaller.

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  • Though I would argue that all the 'general' compounds - eve "governer-general" are in process of changing to a regular plural. – Colin Fine Jan 11 '11 at 17:27
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    Polite disagreement here; "attorneys general" is going strong and reinforcing the rule. – The Raven Mar 28 '11 at 22:50
3

Another example is culs-de-sac, the plural of cul-de-sac.

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