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Where does works a treat come from; is it related to sweets? I cannot find any reference to its origin, are there words omitted such as works [like] a treat?

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It probably derives from the slang meaning of a treat as used in the following examples:

  • a treat, also treato - [late 19C+] wonderfully, extremely, excessively, e.g. that’ll go down a treat.

  • In phrases do one a treat (v.) [late 19C+] to suit one absolutely.

(Green Dictionary of Slang)

The extension of the meaning of treat to something that gives pleasures dates back to the 18th century:

  • extention Sense of "a treating with food and drink, an entertainment given as a compliment or expression of regard" (1650s) was extended by 1770 to "anything that affords much pleasure."

(Etymonline)

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  • Not slang, just informal. – Kris Jun 13 '18 at 12:59
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According to a related question/answer, it seems to be a variant usage; both works a treat and works like a treat are used, though (primarily in British usage) the former is far more common (by about two orders of magnitude).

Treat is defined by Merriam-Webster as "an especially unexpected source of joy, delight, or amusement". So while a sweet would work as a treat, it is an example of a treat, but not itself the core meaning. If something works [like] a treat, it works very well, to the delight of the person who set this up.

A quick glance at websites reveals a common use in article headlines which report about some new investment or building project, change in behaviour or similar. It is usually used to positively evaluate the effectiveness of a remedy, behaviour, or project.

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  • Yes but the question is: where does the expression come from? Why "a treat" means very well? – user121863 Jun 13 '18 at 14:26
  • @user110518 because a treat is something enjoyable, and if something works well, you derive enjoyment out of it. It does not mean 'very well' in other circumstances, *I was eating like a treat does not mean "I was eating very well". – Oliver Mason Jun 13 '18 at 14:38
  • Yes, buy the question is about the origin of this usage. – user121863 Jun 13 '18 at 14:39

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