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Let's take this for example (https://en.wikipedia.org/wiki/Porsche_919_Hybrid):

"The car's weight was reduced by 39 kg, now weighing in at 849 kg (1,872 lb) dry and 888 kg (1,958 lb) with driver ballast."

Why not just say now weighing 849 kg ?

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  • Sounds like they want the "weigh in" bit.
    – Lawrence
    Jun 18, 2018 at 8:18
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    I believe it's more of an "official" (act of) measurement, rather than just a statement of fact; however, I cannot find anything about this in any dictionary definitions (which is why I'm leaving it as a comment, rather than an answer). Jun 18, 2018 at 9:11
  • @Oliver Mason There must be the connotation of physical power / competition here too. 'Table-tennis balls / lace doilies weigh in at ...' would only be used in a tongue-in-cheek register. Jun 18, 2018 at 9:40

2 Answers 2

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Weigh in

(of a boxer or jockey) be officially weighed before or after a contest

This has been used to reference the competition that exists between car manufacturers regarding the specifications of their vehicles.

It would be perfectly appropriate to just say 'now weighing 849kg', however this would lose some of the author's intent.

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Weigh In
To be officially weighed before competing in a sport, especially boxing or horse racing: Tyson weighed in at 245 lb for the fight.

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  • This does not address OP's question about the broadened usage. Jun 18, 2018 at 9:08
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    @EdwinAshworth I think it's the notion of being 'official' that makes the difference between the two usages. Jun 18, 2018 at 9:12
  • @Oliver Mason That would suggest the broadened usage had the answerer included it. Manhatton makes it explicit. Jun 18, 2018 at 9:34

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